Aperture Digital Photography Fundamentals
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A Quick Guide to HDR Photography
A quick guide to HDR photography PUBLISHED - 15 AUG 2017 Make sure that what your eye sees is what your camera captures, by using HDR in contrasty light situations. HDR – high dynamic range – imaging enables your camera to create an image that captures all the range of contrast in a scene, from the depths of the shadows to the highlights of the brightest areas. This is essentially how your eyes see, but it's a tall order for a camera to record the furthest ends of such a drastic range – if you meter for the highlights (the bright areas), you might lose detail in the shadow areas of the scene, while the other way round you risk 'blown-out' highlights. A common example is a well-exposed room interior flooded with light from the windows. If you expose to capture what's outside those windows, the room's details will be lost in shadow. Another is when shooting outdoors: the sunlight that creates bright highlights will also create dark shadows, but expose for one and you'll lose detail in the other. When you make an HDR image, on the other hand, what you see is what you're going to get, because you create it with a series of bracketed exposures to capture both the highlights and the shadow detail. 1 of 3 © NIKON SCHOOL Built-in HDR Some Nikon DSLRs have a built-in HDR mode that does it for you. Available when shooting JPEG only, it automatically takes two quick shots – the first slightly underexposed (darker) and the second exposure slightly overexposed (brighter) – then combines them in-camera to create one well-balanced, tonally wide-ranging image. -
“Digital Single Lens Reflex”
PHOTOGRAPHY GENERIC ELECTIVE SEM-II DSLR stands for “Digital Single Lens Reflex”. In simple language, a DSLR is a digital camera that uses a mirror mechanism to either reflect light from a camera lens to an optical viewfinder (which is an eyepiece on the back of the camera that one looks through to see what they are taking a picture of) or let light fully pass onto the image sensor (which captures the image) by moving the mirror out of the way. Although single lens reflex cameras have been available in various shapes and forms since the 19th century with film as the recording medium, the first commercial digital SLR with an image sensor appeared in 1991. Compared to point-and-shoot and phone cameras, DSLR cameras typically use interchangeable lenses. Take a look at the following image of an SLR cross section (image courtesy of Wikipedia): When you look through a DSLR viewfinder / eyepiece on the back of the camera, whatever you see is passed through the lens attached to the camera, which means that you could be looking at exactly what you are going to capture. Light from the scene you are attempting to capture passes through the lens into a reflex mirror (#2) that sits at a 45 degree angle inside the camera chamber, which then forwards the light vertically to an optical element called a “pentaprism” (#7). The pentaprism then converts the vertical light to horizontal by redirecting the light through two separate mirrors, right into the viewfinder (#8). When you take a picture, the reflex mirror (#2) swings upwards, blocking the vertical pathway and letting the light directly through. -
Depth of Field PDF Only
Depth of Field for Digital Images Robin D. Myers Better Light, Inc. In the days before digital images, before the advent of roll film, photography was accomplished with photosensitive emulsions spread on glass plates. After processing and drying the glass negative, it was contact printed onto photosensitive paper to produce the final print. The size of the final print was the same size as the negative. During this period some of the foundational work into the science of photography was performed. One of the concepts developed was the circle of confusion. Contact prints are usually small enough that they are normally viewed at a distance of approximately 250 millimeters (about 10 inches). At this distance the human eye can resolve a detail that occupies an angle of about 1 arc minute. The eye cannot see a difference between a blurred circle and a sharp edged circle that just fills this small angle at this viewing distance. The diameter of this circle is called the circle of confusion. Converting the diameter of this circle into a size measurement, we get about 0.1 millimeters. If we assume a standard print size of 8 by 10 inches (about 200 mm by 250 mm) and divide this by the circle of confusion then an 8x10 print would represent about 2000x2500 smallest discernible points. If these points are equated to their equivalence in digital pixels, then the resolution of a 8x10 print would be about 2000x2500 pixels or about 250 pixels per inch (100 pixels per centimeter). The circle of confusion used for 4x5 film has traditionally been that of a contact print viewed at the standard 250 mm viewing distance. -
Depth of Focus (DOF)
Erect Image Depth of Focus (DOF) unit: mm Also known as ‘depth of field’, this is the distance (measured in the An image in which the orientations of left, right, top, bottom and direction of the optical axis) between the two planes which define the moving directions are the same as those of a workpiece on the limits of acceptable image sharpness when the microscope is focused workstage. PG on an object. As the numerical aperture (NA) increases, the depth of 46 focus becomes shallower, as shown by the expression below: λ DOF = λ = 0.55µm is often used as the reference wavelength 2·(NA)2 Field number (FN), real field of view, and monitor display magnification unit: mm Example: For an M Plan Apo 100X lens (NA = 0.7) The depth of focus of this objective is The observation range of the sample surface is determined by the diameter of the eyepiece’s field stop. The value of this diameter in 0.55µm = 0.6µm 2 x 0.72 millimeters is called the field number (FN). In contrast, the real field of view is the range on the workpiece surface when actually magnified and observed with the objective lens. Bright-field Illumination and Dark-field Illumination The real field of view can be calculated with the following formula: In brightfield illumination a full cone of light is focused by the objective on the specimen surface. This is the normal mode of viewing with an (1) The range of the workpiece that can be observed with the optical microscope. With darkfield illumination, the inner area of the microscope (diameter) light cone is blocked so that the surface is only illuminated by light FN of eyepiece Real field of view = from an oblique angle. -
Depth of Field Lenses Form Images of Objects a Predictable Distance Away from the Lens. the Distance from the Image to the Lens Is the Image Distance
Depth of Field Lenses form images of objects a predictable distance away from the lens. The distance from the image to the lens is the image distance. Image distance depends on the object distance (distance from object to the lens) and the focal length of the lens. Figure 1 shows how the image distance depends on object distance for lenses with focal lengths of 35 mm and 200 mm. Figure 1: Dependence Of Image Distance Upon Object Distance Cameras use lenses to focus the images of object upon the film or exposure medium. Objects within a photographic Figure 2 scene are usually a varying distance from the lens. Because a lens is capable of precisely focusing objects of a single distance, some objects will be precisely focused while others will be out of focus and even blurred. Skilled photographers strive to maximize the depth of field within their photographs. Depth of field refers to the distance between the nearest and the farthest objects within a photographic scene that are acceptably focused. Figure 2 is an example of a photograph with a shallow depth of field. One variable that affects depth of field is the f-number. The f-number is the ratio of the focal length to the diameter of the aperture. The aperture is the circular opening through which light travels before reaching the lens. Table 1 shows the dependence of the depth of field (DOF) upon the f-number of a digital camera. Table 1: Dependence of Depth of Field Upon f-Number and Camera Lens 35-mm Camera Lens 200-mm Camera Lens f-Number DN (m) DF (m) DOF (m) DN (m) DF (m) DOF (m) 2.8 4.11 6.39 2.29 4.97 5.03 0.06 4.0 3.82 7.23 3.39 4.95 5.05 0.10 5.6 3.48 8.86 5.38 4.94 5.07 0.13 8.0 3.09 13.02 9.93 4.91 5.09 0.18 22.0 1.82 Infinity Infinite 4.775 5.27 0.52 The DN value represents the nearest object distance that is acceptably focused. -
Canon Lenses Canon Lenses from Snapshots to Great Shots
final spine = 0.4625" Canon Lenses Lenses Canon From Snapshots to Great Shots You own a Canon DSLR, but which Canon lens is best for your shooting Jerod Foster is an style and your budget? This guide by pro photographer Jerod Foster editorial and travel From Snapshots to Great Shots Great Snapshots to From will help you learn the features of Canon lenses to capture the photographer and author of Sony NEX-6: From stunning pictures you want for a price that matches your needs. Snapshots to Great Shots; Foster starts with the basics of using lenses in the Canon lineup— Color: A Photographer’s Guide to Directing the Canon Lenses from kit, to prime, to wide angle, to telephoto, to zoom, and more. Whether it’s portraits, landscapes, sports, travel, or night photography, Eye, Creating Visual Depth, and Con- veying Emotion; and Storytellers: A you will have a better understanding of the different Canon lenses Photographer’s Guide to Developing and your choices for investing in them. In this guide you will: From Snapshots to Great Shots Themes and Creating Stories with • Master the key camera features that relate to lenses—depth Pictures. He also leads photography of field, perspective, and image stabilization workshops and is a photography professor at Texas Tech University. Visit • Learn the difference between full frame versus cropped sensors his website and read his popular and how they affect specific lenses photography blog at jerodfoster.com. • Understand best practices for maintaining your lenses and for taking better pictures • Accessorize -
What's a Megapixel Lens and Why Would You Need One?
Theia Technologies white paper Page 1 of 3 What's a Megapixel Lens and Why Would You Need One? It's an exciting time in the security department. You've finally received approval to migrate from your installed analog cameras to new megapixel models and Also translated in Russian: expectations are high. As you get together with your integrator, you start selecting Что такое мегапиксельный the cameras you plan to install, looking forward to getting higher quality, higher объектив и для чего он resolution images and, in many cases, covering the same amount of ground with нужен one camera that, otherwise, would have taken several analog models. You're covering the basics of those megapixel cameras, including the housing and mounting hardware. What about the lens? You've just opened up Pandora's Box. A Lens Is Not a Lens Is Not a Lens The lens needed for an IP/megapixel camera is much different than the lens needed for a traditional analog camera. These higher resolution cameras demand higher quality lenses. For instance, in a megapixel camera, the focal plane spot size of the lens must be comparable or smaller than the pixel size on the sensor (Figures 1 and 2). To do this, more elements, and higher precision elements, are required for megapixel camera lenses which can make them more costly than their analog counterparts. Figure 1 Figure 2 Spot size of a megapixel lens is much smaller, required Spot size of a standard lens won't allow sharp focus on for good focus on megapixel sensors. a megapixel sensor. -
EVERYDAY MAGIC Bokeh
EVERYDAY MAGIC Bokeh “Our goal should be to perceive the extraordinary in the ordinary, and when we get good enough, to live vice versa, in the ordinary extraordinary.” ~ Eric Booth Welcome to Lesson Two of Everyday Magic. In this week’s lesson we are going to dig deep into those magical little orbs of light in a photograph known as bokeh. Pronounced BOH-Kə (or BOH-kay), the word “bokeh” is an English translation of the Japanese word boke, which means “blur” or “haze”. What is Bokeh? bokeh. And it is the camera lens and how it renders the out of focus light in Photographically speaking, bokeh is the background that gives bokeh its defined as the aesthetic quality of the more or less circular appearance. blur produced by the camera lens in the out-of-focus parts of an image. But what makes this unique visual experience seem magical is the fact that we are not able to ‘see’ bokeh with our superior human vision and excellent depth of field. Bokeh is totally a function ‘seeing’ through the lens. Playing with Focal Distance In addition to a shallow depth of field, the bokeh in an image is also determined by 1) the distance between the subject and the background and 2) the distance between the lens and the subject. Depending on how you Bokeh and Depth of Field compose your image, the bokeh can be smooth and ‘creamy’ in appearance or it The key to achieving beautiful bokeh in can be livelier and more energetic. your images is by shooting with a shallow depth of field (DOF) which is the amount of an image which is appears acceptably sharp. -
Using Depth Mapping to Realize Bokeh Effect with a Single Camera Android Device EE368 Project Report Authors (SCPD Students): Jie Gong, Ran Liu, Pradeep Vukkadala
Using Depth Mapping to realize Bokeh effect with a single camera Android device EE368 Project Report Authors (SCPD students): Jie Gong, Ran Liu, Pradeep Vukkadala Abstract- In this paper we seek to produce a bokeh Bokeh effect is usually achieved in high end SLR effect with a single image taken from an Android device cameras using portrait lenses that are relatively large in size by post processing. Depth mapping is the core of Bokeh and have a shallow depth of field. It is extremely difficult effect production. A depth map is an estimate of depth to achieve the same effect (physically) in smart phones at each pixel in the photo which can be used to identify which have miniaturized camera lenses and sensors. portions of the image that are far away and belong to However, the latest iPhone 7 has a portrait mode which can the background and therefore apply a digital blur to the produce Bokeh effect thanks to the dual cameras background. We present algorithms to determine the configuration. To compete with iPhone 7, Google recently defocus map from a single input image. We obtain a also announced that the latest Google Pixel Phone can take sparse defocus map by calculating the ratio of gradients photos with Bokeh effect, which would be achieved by from original image and reblured image. Then, full taking 2 photos at different depths to camera and defocus map is obtained by propagating values from combining then via software. There is a gap that neither of edges to entire image by using nearest neighbor method two biggest players can achieve Bokeh effect only using a and matting Laplacian. -
Digital Camera Basics Slides
DIGITAL CAMERA BASICS BRIC AGENDA • Part 1: Camera Basics • Part 2: Composition PART 1: CAMERA BASICS • The exposure triangle • Depth of field, macro, focus • Shooting modes: Automatic, AV, TV, Manual • White balance • Holding the camera, angles, position THE EXPOSURE TRIANGLE LIGHT METER THE EXPOSURE TRIANGLE: ISO • Film speed, sensor sensitivity: 100, 200, 400, 800, 1600, 3200 • Each setting is double or half the brightness than the previous • Low ISO = sharper pictures • High ISO = lowers the light you need • Trade off: while it offers more flexibility, the higher the ISO, the grainier the picture THE EXPOSURE TRIANGLE: ISO ISO 100 ISO 3200 from digital photography school THE EXPOSURE TRIANGLE: ISO A few questions to ask yourself: 1. Do I have a tripod? 2. Do I want a grainy shot? 3. How is the light? 4. Is the subject still or moving around? Situations where you may need a higher ISO: 1. Indoor sporting events 2. Concerts, galleries, churches 3. Birthdays, or dinners THE EXPOSURE TRIANGLE: ISO Rules of thumb: Use a tripod if you can Try to shoot with the lowest ISO possible Rest camera on a solid surface if there's no tripod Hold your breath LET'S TRY IT! Set your camera to the following manual settings: Shutter Speed: 1/60 Aperature: 2.8 ISO: Shoot the same object four times with four different ISO settings, write down which picture has which ISO. What do you notice? THE EXPOSURE TRIANGLE: SHUTTER SPEED THE EXPOSURE TRIANGLE: SHUTTER SPEED Refers to how much time the shutter is open (in seconds) 1/4000, 1/2000, 1/1000, 1/500, 1/250, -
Making the Transition from Film to Digital
TECHNICAL PAPER Making the Transition from Film to Digital TABLE OF CONTENTS Photography became a reality in the 1840s. During this time, images were recorded on 2 Making the transition film that used particles of silver salts embedded in a physical substrate, such as acetate 2 The difference between grain or gelatin. The grains of silver turned dark when exposed to light, and then a chemical and pixels fixer made that change more or less permanent. Cameras remained pretty much the 3 Exposure considerations same over the years with features such as a lens, a light-tight chamber to hold the film, 3 This won’t hurt a bit and an aperture and shutter mechanism to control exposure. 3 High-bit images But the early 1990s brought a dramatic change with the advent of digital technology. 4 Why would you want to use a Instead of using grains of silver embedded in gelatin, digital photography uses silicon to high-bit image? record images as numbers. Computers process the images, rather than optical enlargers 5 About raw files and tanks of often toxic chemicals. Chemically-developed wet printing processes have 5 Saving a raw file given way to prints made with inkjet printers, which squirt microscopic droplets of ink onto paper to create photographs. 5 Saving a JPEG file 6 Pros and cons 6 Reasons to shoot JPEG 6 Reasons to shoot raw 8 Raw converters 9 Reading histograms 10 About color balance 11 Noise reduction 11 Sharpening 11 It’s in the cards 12 A matter of black and white 12 Conclusion Snafellnesjokull Glacier Remnant. -
Owner's Manual Read Before Using
Preparation Basic Advance Read before using Owner’s Manual this camera. Mode Thank you for purchasing this product. Please follow the instructions given in this manual carefully. Features d The 28mm F2.8 and 38mm F2.8 SUPER-EBC FUJINON lens delivers high quality images. d The program AE mode offers beginners easy photo taking while the aperture AE mode widens the range of expression. d High-speed shutter up to 1/500 sec. with aperture setting of F2.8 enables various photos to be taken. d The viewfinder display shows all functions you need such as shutter speed (in 1/2 step) and the exposure modes. d Versatile aperture techniques realized with the easy-to-use exposure compensation dial and AEB (Auto Exposure Bracketing) function. d The separate AF lock button best suitable for snapshot photography d The film sensitivity mode enables you to set the film speed (ISO) manually. d N mode generates “natural” photos with non-flash shooting while using an ultra-sensitive film. Accessories The product includes following accessories. Make sure to check the contents of the package. Lithium battery CR2 (1) Owner’s Manual (this document) (1) Neck Strap (1) Warranty Certificate (1) 2 Contents Features ......................................... 2 Mode Important Safety Notice .......................... 4 Selecting Modes ............................. .40 Part Names. ..................................... 6 List of Modes ................................ .43 Preparation Selecting Flash Mode ........................ .44 e AEB (Auto Exposure Bracketing) Attaching the Strap........................... .12 Photography . 48 Loading the Battery .......................... .12 m Manual-Focus Photography . 52 Turning the Camera ON ...................... 14 b Bulb Photography . 56 Turning the Camera OFF..................... 14 T Self Timer Photography .