DOCSLIB.ORG

Shutter at High Speed

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Shutter at High Speed TECHNOLOGY CENTRAL SHUTTERS SHUTTER AT HIGH SPEED In the age of megapixels and color spaces we often take the basic compo- nents of camera technology for granted. Photographers tend to overlook the ingenuity of the shutter mechanism installed in HC lenses – and yet it is no less of a technical feat than all the other components in the H System. BY HaNNS W. FRIEDRICH At Hasselblad in Gothenburg/Swe- central shutter, on the other hand, PhOTO: RICHARD DawSON den, Tomas Johansson, the developer freezes any movement far more in charge of the central shutter mech- effectively while also completely sup- anism, cranks a test unit, sets it off pressing the influence of the ambient and watches it fire away for minutes light. The photo on the left illustrates at incredible speed. “The H camera the concept: spray water could never might not take 20 pictures per sec- have been frozen as effectively in a ond, but that has nothing to do with well-lit studio with the H3D set to a the shutter,” he remarks with a grin. flash sync speed of 1/125 second. The Swedes are proud of their shut- A focal plane shutter generally ter. It’s one of the H System’s core uses a vertical slit to expose every components and the ‘mechatronical’ pixel or grain line by line, thus cover- device is as simple as it is ingenious. ing the image plane at rapid speed. H System users enjoy its unsurpassed Flash photography requires the first precision and versatility. Laymen will shutter curtain to open entirely ask, what’s the big deal with a shutter before the second can shut the film mechanism that shoots only 1/800 window. It calls for a 1/60, 1/125 or, second at maximum speed? Even at best, 1/250 second shortest flash amateur cameras with focal plane shutters – installed in the camera, as opposed to every lens – are known to SYNOPSIS fire away at 1/8000 second. But, the • The H System’s central lens pros will know. Central shutters have shutter allows for flash photogra- obvious advantages: for example, phy at 1/800 sec – the camera’s flash units can be used throughout fastest shutter speed. In this all shutter speeds – including the area, it outshines the focal plane 1/800 second setting. shutters found in 35mm systems. • The patented ’mechatronical‘ ADVANTAGES OF THE shutter built in Sweden causes CENTRAL SHUTTER almost no vibration, uses a mini- There is, in fact, a whole array of mum amount of movable parts positive assets in the central shut- and consumes very little energy. ter. It allows for approximately three • Super high-tech materials and exposure values more flash sync a sophisticated control board speed than a focal plane shutter. inside every H lens ensure super- This means flash photography with lative operation. almost entirely suppressed ambient • The shutter is very precise light, providing the photographer and reliable. Its lifespan extends with absolute control over his light- far beyond 100.000 exposures. ing. What starts out being beneficial • Hasselblad’s True Exposure in the studio proves to be downright mode guarantees correct indispensable in some flash scenar- exposures independently of the ios outdoors. aperture setting. Richard Dawson took this Where the exposure is longer and picture for GQ magazine using subjects are moving, available light a Hasselblad H3D-39 with may lead to an unsharp secondary the flash set to 1/800 to virtually exposure whith blurry contours. The freeze the spray water significantly faster sync speeds of a 2/2008 33 24470_UK_VIC_0208_3235_T_Shutter33 33 25.04.2008 6:40:39 Uhr TECHNOLOGY CENTRAL SHUTTERS hair. The construction is designed think. Counter impulses – generated to cause minimal abrasion and work by magnetic fields – prevent the seamlessly. blades from bouncing back (and forth!) after opening or closing. The TWO VERSIONS OF 20 fastest internal speeds, from 1/250 THE SHUTTER to 1/800 seconds, are each controlled by a reference table, listing the con- Hasselblad builds the shutter in two ditions, length and strength of the sizes: one measures 20 millimeters electro-magnetic impulses. The in diameter, the other 28. The large tables are installed in the shutter’s version is used for high-speed and control board and become increas- tele lenses. The larger the shutter, the ingly sophisticated at faster speeds. more difficult to build. For instance Designers went to great lengths to the blades of the 20 mm version weigh puzzle out these lists with sophisti- 0.13 grams and the shutter spring cated measuring tools and high-speed develops a force of about 7 Newton, cameras. The extreme precision they the equivalent of 700 grams. The obtain is then made real when every large 28 mm shutter, in turn, requires shutter is gauged and calibrated indi- two motors to move the 0.22 gram vidually in the factory. The H shutter comes in two types: shutter blades with a speed equal to 2 The electronic control mechanism the smaller 20 mm version (left) that of the smaller model. At 35 N warrants exposure speeds with supe- has one motor; the larger, more and 3.5 kg, the springs call for five rior accuracy. It’s highly beneficial sophisticated 28 mm shutter uses times the tractive force, making the in specialized fields like aerial pho- two motors for compatibility with 28 mm version far bigger and more tography where it guarantees 100 telephoto and high-speed lenses sophisticated. An even larger mecha- percent synchronized exposures nism for even bigger and faster lenses using various lenses. It also enables could no longer be manufactured True Exposure. Here, an electronic under reliable, economic conditions control considers that the shutter sync speed – all depending on the known to use both central shutters camera system and type of shutter. and focal plane shutters. The general Exposures take as long as the flash inclination, though, has always been sync speed, or longer: i.e., even if toward the central shutter. Users the shutter speed is set at 1/2000, prefer advanced flash compatibility it might still take 1/125 second for to lighting-fast shutter speed. The the shutter to perform. Any move- ‘mechatronical’ central shutter was ment during this time – whether by in fact built before the H camera, as the camera or the subject – can lead the H1 requires lenses with absolutely to visible distortion as is frequently precise, electronically controllable seen in sports images. The central internal shutters. The mechanical shutter, on the other hand, will have levers in the lens bayonet are thus nothing to do with this ‘rolling shut- made redundant. The central shutter is installed effects from opening the shutter the middle. The light-weight, ter’ effect. It sits in the optical center inside the lens, back to back with from the middle to the outer sides, high-speed blades guarantee pre- of the lens right behind the aperture. THE HAssELBLAD the aperture. There are no side first leaving the light through in cise exposure speed at 1/800 sec For this reason, it makes no differ- CENTRAL SHUTTER ence that the central shutter cannot open or close with infinite speed. It 1 The basic principle behind the opens first in the middle and closes shutter control system, conceptual- last in the middle: the fast, aperture- ized and patented in Sweden, is as the moving system. This is a clever – especially not if it is to perform at – which opens in a circular fashion like opening and closing mechanism simple as it is ingenious: a mecha- idea that boasts a number of advan- 1/800 second. However, we would from center to edges – clears a small has no optical repercussions and nism transfers the angular movement tages: for one, the shutter will remain expect no less from the H lenses. aperture faster than a wide-open one. doesn’t lead to vignetting. of a lever onto the shutter blades. open or closed without using any Speeds of 1/500 second and slower Since the introduction of the H1, the An added bonus of the central The core piece, a powerful, M-shaped energy whatsoever. Both states are use, almost exclusively, the force photographer no longer has to cor- shutter is that it causes virtually no spring, would normally keep the stable and autonomous. of the spring to open and close the rect the exposure – something even vibration. The forces applied by the lever locked in the center position. As a whole, it’s a motor-less shutter shutter. The lever moves in tandem most experienced photographers tiny, ring-shaped shutter blades are It is attached to an anchor held by solution that uses very little energy. with the speed of the powerful coil as would overlook – when the aperture neutralized almost entirely. The two two fixed neodymium magnets on With the majority of shutter speeds, it springs freely. The magnetic field is small. curtains of the focal plane shutter, by both sides, i.e., in the open or closed the magnetic-field-enhanced ‘push’ will compensate for any mechanical 3 Hasselblad makes no compro- comparison, spring off in the same state. When the anchor touches one described above is only really needed abrasion using a nominal amount of mises when it comes to the accuracy direction only to hit resistance and of the magnets, the magnetic circuit to help compensate the nominal fric- energy. Faster speeds, on the other of the shutter. Internally, the Swedes cause camera shake. Normally, any is closed and a large holding force is tion caused by the shutter. The spring hand, call for more acceleration.
Load more

Recommended publications
  • Shutter Stream Product Photography Software *IMPORTANT
    Quick Start Guide – Shutter Stream Product Photography Software *IMPORTANT – You must follow these steps before starting: 1. Registering the Software: After installing the software and at the time of first launch, users will be prompted with a registration page. This is required. Please fill out this form in its entirety, select ‘ShutterStream’ license type then submit – this will be automatically sent to our licensing server. Within 72 hours, user will receive their license file along with license file import instructions (sent via email to the address used at time of registration) the software. The software will remain fully functional in the meantime. 2. Setting up your Compatible Camera: Please select your specific camera model from this page for the required settings. Additional Training Documents: Shutter Stream Full User Guide: See here Features Overview Video: See Here Help Desk & Support: Help Desk: http://confluence.iconasys.dmmd.net/display/SHSKB/Shutter+Stream+Knowledge+Base Technical Support: Please email [email protected] to open up a support ticket. © Iconasys Inc. 2013-2018 Overview - Shutter Stream UI 1. Image Capture Tools 2. Image Viewing Gallery 3. Image Processing Tools 4. Live View / Image Viewing Window 5. Camera Setting Taskbar 6. Help and Options 4 6 1 3 5 2 **Make sure camera has been connected via USB to computer and powered on before launching software Shutter Stream Product Photography Workflow: Step 1 – Place an object in Cameras Field of View and Click the Live View button (top left corner of software): ‘Live View’ will stream the cameras live view to the monitor screen in real time so users can view the subject they wish to shoot before actually capturing the image.
    [Show full text]
  • Completing a Photography Exhibit Data Tag
    Completing a Photography Exhibit Data Tag Current Data Tags are available at: https://unl.box.com/s/1ttnemphrd4szykl5t9xm1ofiezi86js Camera Make & Model: Indicate the brand and model of the camera, such as Google Pixel 2, Nikon Coolpix B500, or Canon EOS Rebel T7. Focus Type: • Fixed Focus means the photographer is not able to adjust the focal point. These cameras tend to have a large depth of field. This might include basic disposable cameras. • Auto Focus means the camera automatically adjusts the optics in the lens to bring the subject into focus. The camera typically selects what to focus on. However, the photographer may also be able to select the focal point using a touch screen for example, but the camera will automatically adjust the lens. This might include digital cameras and mobile device cameras, such as phones and tablets. • Manual Focus allows the photographer to manually adjust and control the lens’ focus by hand, usually by turning the focus ring. Camera Type: Indicate whether the camera is digital or film. (The following Questions are for Unit 2 and 3 exhibitors only.) Did you manually adjust the aperture, shutter speed, or ISO? Indicate whether you adjusted these settings to capture the photo. Note: Regardless of whether or not you adjusted these settings manually, you must still identify the images specific F Stop, Shutter Sped, ISO, and Focal Length settings. “Auto” is not an acceptable answer. Digital cameras automatically record this information for each photo captured. This information, referred to as Metadata, is attached to the image file and goes with it when the image is downloaded to a computer for example.
    [Show full text]
  • Digital Camera Functions All Photography Is Based on the Same
    Digital Camera Functions All photography is based on the same optical principle of viewing objects with our eyes. In both cases, light is reflected off of an object and passes through a lens, which focuses the light rays, onto the light sensitive retina, in the case of eyesight, or onto film or an image sensor the case of traditional or digital photography. The shutter is a curtain that is placed between the lens and the camera that briefly opens to let light hit the film in conventional photography or the image sensor in digital photography. The shutter speed refers to how long the curtain stays open to let light in. The higher the number, the shorter the time, and consequently, the less light gets in. So, a shutter speed of 1/60th of a second lets in half the amount of light than a speed of 1/30th of a second. For most normal pictures, shutter speeds range from 1/30th of a second to 1/100th of a second. A faster shutter speed, such as 1/500th of a second or 1/1000th of a second, would be used to take a picture of a fast moving object such as a race car; while a slow shutter speed would be used to take pictures in low-light situations, such as when taking pictures of the moon at night. Remember that the longer the shutter stays open, the more chance the image will be blurred because a person cannot usually hold a camera still for very long. A tripod or other support mechanism should almost always be used to stabilize the camera when slow shutter speeds are used.
    [Show full text]
  • Film Camera That Is Recommended by Photographers
    Film Camera That Is Recommended By Photographers Filibusterous and natural-born Ollie fences while sputtering Mic homes her inspirers deformedly and flume anteriorly. Unexpurgated and untilled Ulysses rejigs his cannonball shaming whittles evenings. Karel lords self-confidently. Gear for you need repairing and that film camera is photographers use our links or a quest for themselves in even with Film still recommend anker as selections and by almost immediately if you. Want to simulate sunrise or sponsored content like walking into a punch in active facebook through any idea to that camera directly to use film? This error could family be caused by uploads being disabled within your php. If your phone cameras take away in film photographers. Informational statements regarding terms of film camera that is recommended by photographers? These things from the cost of equipment, recommend anker as true software gizmos are. For the size of film for street photography life is a mobile photography again later models are the film camera that is photographers stick to. Bag check fees can add staff quickly through long international flights, and the trek on entire body from carrying around heavy gear could make some break down trip. Depending on your goals, this concern make digitizing your analog shots and submitting them my stock photography worthwhile. If array passed by making instant film? Squashing ever more pixels on end a sensor makes for technical problems and, in come case, it may not finally the point. This sounds of the rolls royce of london in a film camera that is by a wide range not make photographs around food, you agree to.
    [Show full text]
  • Shutter Speed in Digital Photography Stephen Sagers, Tooele County 4-H Agent Ron Patterson, Carbon County Ag/4-H Agent
    March 2012 4H/Photography/2012-03pr Shutter Speed in Digital Photography Stephen Sagers, Tooele County 4-H Agent Ron Patterson, Carbon County Ag/4-H Agent Photography is the process of recording light. Film The Shutter cameras recorded the light on to the film while digital cameras record light on an image sensor. In The shutter is located behind the lens and mirrors order to prevent bright or dim light from creating an and opens when a photograph is taken. Most consumer cameras can shoot pictures with shutter overexposed or underexposed image the shutter th must open and close in the right amount of time. speeds from 1/2000 of a second to several seconds The amount of time it is opened depends on three (or indefinitely.) This feature is useful for freezing factors: the light intensity, the aperture setting, and motion or capturing effects like fireworks or the ISO or film speed. (Refer to separate factsheets running water. on ISO and aperture for a more detailed definition of these concepts.) In order to achieve proper exposure these three features must be balanced. The shutter speed is the easiest to adjust in order to obtain proper exposure. Exposure In digital photography exposure refers to the amount of light that reaches the image sensor. When too much light is recorded the picture will be washed out — overexposed. When too little light is recorded the image will be dark — underexposed. Figure 1. The inside of a film camera. The mirror Usually, neither situation is desirable. and shutter behind it move when it shoots a photograph.
    [Show full text]
  • Digital Photography Basics for Beginners
    DIGITAL PHOTOGRAPHY BASICS FOR BEGINNERS by Robert Berdan [email protected] www.canadiannaturephotographer.com These notes are free to use by anyone learning or teaching photography. 1. Choosing a camera - there are 2 main types of compact cameras A) Point and Shoot Camera (some have interchangeable lenses most don't) - you view the scene on a liquid crystal display (LCD) screen, some cameras also offer viewfinders. B) Single Lens Reflex (SLR) - cameras with interchangeable lenses let you see the image through the lens that is attached to the camera. What you see is what you get - this feature is particularly valuable when you want to use different types of lenses. Digital SLR Camera with Interchangeable zoom lens 1 Point and shoot cameras are small, light weight and can be carried in a pocket. These cameras tend to be cheaper then SLR cameras. Many of these cameras offer a built in macro mode allowing extreme close-up pictures. Generally the quality of the images on compact cameras is not as good as that from SLR cameras, but they are capable of taking professional quality images. SLR cameras are bigger and usually more expensive. SLRs can be used with a wide variety of interchangeable lenses such as telephoto lenses and macro lenses. SLR cameras offer excellent image quality, lots of features and accessories (some might argue too many features). SLR cameras also shoot a higher frame rates then compact cameras making them better for action photography. Their disadvantages include: higher cost, larger size and weight. They are called Single Lens Reflex, because you see through the lens attached to the camera, the light is reflected by a mirror through a prism and then the viewfinder.
    [Show full text]
  • The Art, Science and Algorithms of Photography This Week Exposure Shutter Speed Side-Effect of Shutter Speed Creative Shutter Sp
    This Week • Exposure (today) The Art, Science and Algorithms – Camera Basics of Photography – Simple Math • Metering Exposure & Metering • Zone System Maria Hybinette 1 2 Maria Hybinette Exposure Shutter Speed • Controls light to digital sensor (or film) • Controls how long the sensor is exposed to light • Two main controls (parameters): • Linear effect on exposure until sensor saturates – Shutter Speed • Denoted in fraction of a second: – 1/30, 1/60, 1/125, 1/250, 1/500 • Controls amount of time light ‘shines’ on the sensor – Get the pattern ? – Aperture On a normal lens, hand-hold down to 1/60 • Controls the amount of light falls on a unit area per • second – Rule of thumb: shortest exposure: 1/ focal length • 1/50 for a 50 mm lens (slower motion blur) • Exposure = Irradiance x Time • 1/500 for a 500mm lens, – so large lenses needs faster shutter speeds to avoid camera Aperture Control: Amount of light falling shake on a unit area of sensor per second. 3 Photo Credit: 4 Side-Effect of Shutter Speed Creative Shutter Speeds Photo Credit: • Motion Blur Pasant @Flickr • Halving the shutter doubles the motion blur. 3 seconds 4 seconds Bulb: 3-10 second 1/30 Panning 30 seconds 15 seconds Wikipedia Fast Shu:er Speed Slow Shu:er Speed 6 5 Photo Credit: Wikipedia, Cooriander & Pasant @flickr Effect of shutter speed Shutters • Freezing motion • Central Shutters – Rule of thumb – Mounted within lens assembly (some in-front of lens, early cameras) Walking people Running people Car Fast train – Leaf mechanism generally used for this (see next slide for a simple version) 1/125th second – Diaphragm shutter (thin blades) 1/500th second • Focal plane shutters near the focal plane and 1/125 1/250 1/500 1/1000 moves to uncover sensor • Modern are mostly electronic • Digital cameras typically use a combination of mechanical and electronic timings Photo Credit: 7 Fredo Durand 8 Shutter Shutter • Simple leaf-shutter, typically Simple Leaf Shu3er only one speed 1.
    [Show full text]
  • Shutter Speed Refers to the Amount of Time Your Sensor Is Exposed to Light
    The 2nd part of the photographic triangle Shutter speed refers to the amount of time your sensor is exposed to light. In film photography shutter speed was the length of time that the film was exposed to the scene you’re taking a picture of. In digital photography, it is the same except that your film is replaced with a sensor that does the same thing. Shutter speed can range from very slow speeds such several seconds (or minutes on the Bulb setting) to 1/1600 of a second or faster. It might help to visualize your shutter literally as a door, with your shutter speed controlling how fast or how slow the door opens and closes. In most cases you’ll probably be using shutter speeds of 1/60th of a second or faster. This is because anything slower than this is very difficult to use without getting camera shake. http://flickr.com/photos/konaboy/72845202 / The faster you set your shutter speed, the more you will “freeze” motion. some cameras go as fast as 1/8000th sec! Alternately some images made at night with a tripod can be several hours long. If handholding try not to use a speed below 1/60thsec. Longer lenses need faster speeds to obtain a sharp image, i.e. 200mm lens use 1/250th. A faster shutter speed doesn’t allow light to hit your sensor for a long amount of time. The fastest shutter speed on record is from the “Steam” Camera, which uses lasers or some junk to take really fast photographs (as fast as up to 440 trillionths of a second!).
    [Show full text]
  • Sinar-Mode-Emploi-Shutter-System.Pdf
    Ärehivexerpplaf Unikat slnarNichtveräusserlich Sinar Autoaperture Shutter InstructionManual $nar 1.Before you start lntroduction We congratulateyou on your purchaseof your SinarAuto- apertureShutter and we appreciateyour confidencein our products.We are convincedthat the SinarAutoaper- ture Shutterwill add significantconvenience to your work. Its robustand preciseconstruction will bringyou longand trouble-free operation. The SinarAutoaperture Shutter is a mechanicallycontrol- led, self-cockingbehind-the-lens shutter with an auto- maticspring-loaded diaphragm that can be used with all Sinaronlenses as well as manvother lenses currentlv on the market. Beforeyou use your Sinar AutoapertureShutter for the firsttime, pleaseread this InstructionManual carefully. lt will help you to use the shuttercorrectly, thus avoiding difficultiesthat mightarise from improperuse. lf you haveany commentsor recommendationsregarding your Sinar AutoapertureShutter or this InstructionMan- ual, please do not hesitateto send us your opinionsin writing. We sincerelywish you much satisfactionin workingwith the Sinar AutoapertureShutter and gratifyingsuccess with your photographs. For those in a hurry lf you are in a big rush, at the very least read the Abbre- viated lnstructionson Page 4. But in order to use the SinarAutoaperture Shutter to your bestadvantage, we do recommendthat sometimelater you readthe full operat- ing instructionsall the way through. Sinar Autoapertule Shutter $nar Operating Gomponents '1 Shutter-open indicator ---------------- ShutterSpeed SelectionLever
    [Show full text]
  • Aperture Iso Shutter Speed
    MODEL PHOTOGRAPHY Produced by Ronald Yeung M.Arch '18 GSAPP Award-winning student portfolios Using photogrpahs of models to highlight concepts of a project - not only to archive model. KaDeWe Renovation OMA Mixed Use No. 2 MOS Architects House for All Seasons Rural Urban Framework Swing Time Höweler + Yoon Architecture ADR MODEL - Kanagawa Institute of Technology Kimberlee Boonbanjerdsri AV OFFICE https://www.arch.columbia.edu/audio-video-office/equipment-request AVAILABLE AT THE AV OFFICE Tripods DSLR Camera Lighting equipment Canon t5i w/ 18-55mm lens WORKFLOW i. SET-UP ii. PHOTOGRAPHY iii. EDITING LIGHTING MANUAL SHOOTING ADOBE BRIDGE 1. Image quality • Batch editing via TRIPOD 2. White balance CAMERA RAW BACKDROP 3. Aperture • Image processing via 4. Shutter speed PHOTOSHOP 5. ISO DEMONSTRATION i. SET-UP LIGHTING i. SET-UP NATURAL LIGHTING • More realistic • Depends on time/weather • Requires specific context ARTIFICIAL LIGHTING • More control and flexibility 1. Turn off overhead lighting 2. Fill light (indirect source) 3. Main light (direct source) DO NOT use more than one main light - it will cast multiple shadows LIGHTING i. SET-UP NATURAL LIGHTING • More realistic • Depends on time/weather • Requires specific context ARTIFICIAL LIGHTING • More control and flexibility 1. Turn off overhead lighting 2. Fill light (indirect source) 3. Main light (direct source) DO NOT use more than one main light - it will cast multiple shadows LIGHTING i. SET-UP ARTIFICIAL LIGHTING Model light study TRIPOD i. SET-UP • Consistent images • Stabilizes camera • Better for shooting macro • Flexibility to move around • Easier to use ‘live view’ BACKDROP i. SET-UP • Minimizes editing and post-processing time • Cleaner images • Photo uniformity and consistency • Light models on dark background, and vice versa.
    [Show full text]
  • CASIO Kündigt Reisekamera An, Die Mit Einer Akkuladung Bis Zu 1.000 Aufnahmen Machen Kann Kompaktkamera Mit 24 Mm Weitwinkelobjektiv Und 12,5Fach Optischem Zoom
    PRESSEINFORMATIONEN CASIO kündigt Reisekamera an, die mit einer Akkuladung bis zu 1.000 Aufnahmen machen kann Kompaktkamera mit 24 mm Weitwinkelobjektiv und 12,5fach optischem Zoom Norderstedt, 6. Januar 2011 - Die CASIO Europe GmbH und ihr Mutterkonzern, CASIO Computer Co., Ltd., haben heute die neue EXILIM EX-H30 Digitalkamera vorgestellt. Dank ihrer enorm langen Akkulaufzeit ist diese Kamera ideal für Reisen und Urlaube geeignet. Die leistungsstarke Batterie sorgt dafür, dass Anwender viele Weitwinkel- oder Teleaufnahmen machen können, ohne ständig an die Akkuladung denken zu müssen. * Gemäß Camera & Imaging Products Association (CIPA-Norm). CASIO hat seine langjährige Erfahrung in Energie sparender Technologie und kompaktem Design bereits in zahlreiche Digitalkameras einfließen lassen, die besonders auf Reisen ihre Vorzüge zeigen. Diese Kameras sind kompakt, bequem zu tragen, verfügen über leistungsstarke Akkus und ein für Reisen wichtiges Weitwinkelobjektiv mit hoher Zoomleistung. Zum aktuellen CASIO Portfolio an ultramobilen Kameras gehören ein Modell mit integriertem Hybrid-GPS-System, ein preisgünstiges Einsteigermodell und nun das neue Modell mit hoher Akkulaufzeit für bis zu 1.000 Aufnahmen pro Batterieladung. Die neue EX-H30 ist eine Reisekamera, die bis zu 1.000 Aufnahmen pro Akkuladung ohne Aufladen ermöglicht. Das schlanke, kompakte Gehäuse der Kamera ist an der dünnsten Stelle gerade einmal 24,2 mm dünn und damit besonders angenehm zu transportieren. Das Modell verfügt über 16,1 Megapixel, ein 24 mm Weitwinkelobjektiv mit 12,5fach optischem Zoom, ein 7,6 cm (3 Zoll) TFT- Farbdisplay (Super Clear LCD) mit einer Auflösung von 460.800 Pixeln und die CCD-Shift- Bildstabilisierung von CASIO zur Reduzierung von Unschärfen durch Handbewegungen. Zusammen mit dem Single Frame SR Zoom von CASIO, der den maximalen Teleobjektiv-Bereich des optischen Zooms um das 1,5-fache erweitert, bietet die Kamera einen effektiven Zoombereich mit 18,8facher Vergrößerung und erhält eine hohe Bildqualität auch bei hochauflösenden Aufnahmen mit 16,1 Megapixel.
    [Show full text]
  • Gamma-Ray Spectral Imaging Using a Single-Shutter Radiation Camera
    Nuclear Instruments and Methods in Physics Research A299 (1990) 495-500 495 North-Holland Gamma-ray spectral imaging using a single-shutter radiation camera T.A. DeVol, D.K. Wehe and G.F. Knoll The University of Michigan, Ann Arbor, MI 48109-2100, USA As part of a program to develop mobile robots for reactor environments, we are developing a radiation-imaging camera capable of operating in medium-intensity ( < 2 R/h), medium-energy ( < 8 MeV) gamma-ray fields . A systematic study of available detectors indicated the advisability of a high-Z scintillator. The raster-scanning camera uses a lead-shielded bismuth germanate (BGO) scmtillator (1.25 cm x1 .25 cm right-circular cylinder) coupled to a photomultiplier tube (PMT) operated in pulse mode. Measure- ments yielded an angular resolution of 2.5° and energy resolution of 12 .9% at 662 keV. The camera motion is totally automated and controlled by stepping motors connected to a remote computer . Several 2D images of radioactive sources have been acquired in fields of up to 400 mR/h and energies up to 2.75 MeV. Some of the images demonstrate the ability of the camera to image a polychromatic field. 1. Introduction aperture is used, images can be obtained without decon- volution. We are interested in developing a portable radiation- imaging camera for imaging gamma-ray fields typically 2.1 . Detector found in a nuclear power station. This portable imager is intended to be mounted on a mobile robot that will The gamma-ray detector consists of a 1 .27 cm x 1 .27 take the camera into the radiation area, acquire the cm right-circular cylinder of bismuth germanate (BGO) image and send the data back to the operator .
    [Show full text]