16 Buyer's Guide

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16 buyer’s guide thisWIN camera! happy See page 34. Despite the plethora of filters and photo apps, good photography is still very much an art. We’ve found some accessories that will help the amateur and the seasoned pro paint a better picture. Olympus OM-D E-M10 camera Here’s the lightest of the Olympus mirror- Petzval Lens less system cameras with a zoom lens that will capture landscapes and people Grab a piece of photographic history with perfectly. You can take it anywhere and this expertly reconstructed Petzval Lens know your images will be amongst the best by Lomography. The new version of the of the new digital breed. Snap away and 1840 original is carved from high-quality bring that vacation action home safely. glass, mounted in brass and comes with removable aperture plates. The lens will add RRP: $899 www.cameraelectronic.com.au swirly bokeh effects and clear centre focus Smartphone Lens Kit to your shots, which you can control with Become a professional photographer simply the manual focus knob. The Petzval Lens by using your smartphone with additional Oh! Wow. Ring Light is compatible with any Nikon F Mount or lens options. This kit of three miniature Canon EF Mount SLR or DSLR camera. lenses – a macro, fish eye and wide-angle Ring flashes are no longer reserved for RRP: $599 www.photojojo.com lense – gives you the tools you need to big budgets with this nifty little accessory replicate the effects of a DSLR. Simply that provides studio-quality lighting. attach the lenses to your smartphone Simply plug into your camera’s hot shoe camera using a built-in magnet. For phones and attach to the front of the lens of that don’t have a metal backing, a set of your Canon or Nikon DSLR. There are adhesive metal rings is included, which three brightness settings that can be used allow the lenses to attach to any device. as a constant light of ring flash that flashes Smartphone lenses are a great option for in sync with the shutter. The circular light even the most experienced photographers cuts down on harsh shadows, helping who sometimes want to leave the bulky create the perfect portrait, indoor and DSLR at home. macro shots. Because the ring light uses AA batteries, you can use it separately to RRP: $25 www.kogan.com.au your camera anywhere you need some extra light. RRP: $99 www.photojojo.com GoPro 3-Way GoPro’s most versatile mount makes it easy to get the shot you want in any situation. Use the mount three ways: as a camera grip, extension arm or tripod. The folding arm is perfect for ‘point of view’ or follow-cam footage and no-one has to know your photo is a selfie because the mount conveniently stays out of the picture. You can steady images using the mini tripod that is stored inside the handle. RRP: $109.95 www.gopro.com.

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PETZVAL's LENS and CAMERA by Rudolf Kingslake
PETZVAL'S LENS AND CAMERA by Rudolf Kingslake Joseph Max Petzval was born on January 6, 1807, in Hungary of German parentage; he died 84 years later in September 1891. Being a member of the mathematics faculty of the University of Vienna, he naturally approached the problem of lens design from a mathematical rather than from an empir ical standpoint, which probably accounted in part for his suc cess. He actually designed two lenses in 1839, the Portrait lens which he immediately commissioned P. F. von Voigtlander to make, and the Orthoscopic lens which was not manufactured T THE OFFICIAL ANNOUNCEMENT of the Daguerreotype until 1856. Petvzal's interest in optics continued throughout the A process in 1839, Austria was represented by Professor A. rest of his life, and he reported in 1843 that "by order of the F. von Ettingshausen. He was so impressed with the possibilities General-Director Archduke Ludwig, he was assisted in his of photography that upon his return to Vienna, he induced his calculations for several years by two officers and eight friend and colleague the mathematician Joseph Petzval to undertake the design of a wide-aperture lens suitable for por traiture. Petzval, then 33 years old, devoted himeslf enthusiasti cally to the problem and was amazingly successful. He used a well-corrected telescope objective the right way round for his front component, and added an airspaced doublet behind it, the rear doublet being mathematically designed to give sharp de finition and to flatten the field. The formula was handed to the old-established Viennese optician Voigtlander, who first supplied the lens to a focal length of 150 mm and an aperture of f/3.6, mounted in a conical metal camera having a circular ground-glass focusing screen 94 mm diameter with a focusing magnifier permanently installed behind it.
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Portraiture, Surveillance, and the Continuity Aesthetic of Blur
Michigan Technological University Digital Commons @ Michigan Tech Michigan Tech Publications 6-22-2021 Portraiture, Surveillance, and the Continuity Aesthetic of Blur Stefka Hristova Michigan Technological University, [email protected] Follow this and additional works at: https://digitalcommons.mtu.edu/michigantech-p Part of the Arts and Humanities Commons Recommended Citation Hristova, S. (2021). Portraiture, Surveillance, and the Continuity Aesthetic of Blur. Frames Cinema Journal, 18, 59-98. http://doi.org/10.15664/fcj.v18i1.2249 Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/15062 Follow this and additional works at: https://digitalcommons.mtu.edu/michigantech-p Part of the Arts and Humanities Commons Portraiture, Surveillance, and the Continuity Aesthetic of Blur Stefka Hristova DOI:10.15664/fcj.v18i1.2249 Frames Cinema Journal ISSN 2053–8812 Issue 18 (Jun 2021) http://www.framescinemajournal.com Frames Cinema Journal, Issue 18 (June 2021) Portraiture, Surveillance, and the Continuity Aesthetic of Blur Stefka Hristova Introduction With the increasing transformation of photography away from a camera-based analogue image-making process into a computerised set of procedures, the ontology of the photographic image has been challenged. Portraits in particular have become reconfigured into what Mark B. Hansen has called “digital facial images” and Mitra Azar has subsequently reworked into “algorithmic facial images.” 1 This transition has amplified the role of portraiture as a representational device, as a node in a network
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The History of Petzval Lenses 11-06-11 14:43
The history of Petzval Lenses 11-06-11 14:43 Antique & Classic Cameras Home Blog Camera Appraisals Rolleiflex Rolleicords Rolleiflex Buying Tip Leica M Lenses 50 Summicron-M Lenses 35 Summicron-M Lenses Leica 28mm M-Lenses Most Watched Leica Leica M Cameras Leica Screw Lenses Leica Screw Cameras Leica Lens Reviews Leica R Lenses Sonnar Lens Petzval Lens Soft Focus Lenses Soft Focus Lenses 2 Soft Focus Lenses 3 Soft Focus Lens Sales Soft Focus Lens Test Heliar Lenses Canon RF Lens Canon 50mm F/1.2 LTM Canon RF Cameras Fuji 6x7 & 6x9 Fuji 645 Cameras Hasselblad 6x6 Hasselblad C Lenses Pentax 6x7 Lenses Ricohflex Nikon RF Lens Zeiss Contax RF Lens Contax G Lens Super Ikonta Minolta-35 RF Pentax M42 Lens Bokeh Fuji 617 Olympus Stylus Epic 1890 Lens Catalogue 1892 Steinheil Lens Ads 1892 Zeiss Lens Ads 1904 Dallmeyer Lens Ads 1904 Busch Lens Ads 1904 Goerz Lens Ads Antique Wood Cameras Photographers 1860-1900 1857 CC Harrison Lens Harrison Globe Lens 1871 Camera Catalog 1883 Blair Envelope 1895 Sunart Camera 1910 Premo Catalog 1848-1875 Advertisements Camera Books Most Watched Lens Vade Mecum Links Contact Us About Us Morgan Low Ball Dollars Petzval Portrait Lenses and Their History Daguerre announced his process to the world on August 19, 1839. The original Daguerre & Giroux Camera utilized a lens designed and manufactured by Charles Chevalier, celebrated microscope maker and son of Vincent Chevalier who founded their optical business in France. The Chevalier 16-inch telescope objective was comprised of a cemented doublet and was achromatic. The lens, which covered a whole plate, had a working aperture of f/17, and suffered from considerable spherical abberations.
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Lens/Mirrors
Refractive Optical Design Systems Any lens system is a tradeoff of many factors Add optical elements (lens/mirrors) to balance these Many different types of lens systems used Want to look at each from the following Performance Requirements Resolution of the lens – how good at seeing fine details Also compensation to reduce lens aberrations Field of View: How much of a object is seen in the image from the lens system F# - that is how fast is the lens i.e. how good is the lens at low light exposures Packaging requirements- can you make it rugged & portable Spectral Range – what wavelengths do you want to see Also how to prevent chromatic aberrations Single Element Poor image quality with spherical lens Creates significant aberrations especially for small f# Aspheric lens better but much more expensive (2-3x higher $) Very small field of view High Chromatic Aberrations – only use for a high f# Need to add additional optical element to get better images However fine for some applications eg Laser with single line Where just want a spot, not a full field of view Landscape Lens Single lens but with aperture stop added i.e restriction on lens separate from the lens Lens is “bent” around the stop Reduces angle of incidence – thus off axis aberrations Aperture either in front or back Simplest cameras use this Achromatic Doublet Typically brings red and blue into same focus Green usually slightly defocused Chromatic blur 25x less than singlet (for f#=5 lens) Cemented achromatic doublet poor at low f# Slight improvement
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The Techniques and Material Aesthetics of the Daguerreotype
The Techniques and Material Aesthetics of the Daguerreotype Michael A. Robinson Submitted for the degree of Doctor of Philosophy Photographic History Photographic History Research Centre De Montfort University Leicester Supervisors: Dr. Kelley Wilder and Stephen Brown March 2017 Robinson: The Techniques and Material Aesthetics of the Daguerreotype For Grania Grace ii Robinson: The Techniques and Material Aesthetics of the Daguerreotype Abstract This thesis explains why daguerreotypes look the way they do. It does this by retracing the pathway of discovery and innovation described in historical accounts, and combining this historical research with artisanal, tacit, and causal knowledge gained from synthesizing new daguerreotypes in the laboratory. Admired for its astonishing clarity and holographic tones, each daguerreotype contains a unique material story about the process of its creation. Clues from the historical record that report improvements in the art are tested in practice to explicitly understand the cause for effects described in texts and observed in historic images. This approach raises awareness of the materiality of the daguerreotype as an image, and the materiality of the daguerreotype as a process. The structure of this thesis is determined by the techniques and materials of the daguerreotype in the order of practice related to improvements in speed, tone and spectral sensitivity, which were the prime motivation for advancements. Chapters are devoted to the silver plate, iodine sensitizing, halogen acceleration, and optics and their contribution toward image quality is revealed. The evolution of the lens is explained using some of the oldest cameras extant. Daguerre’s discovery of the latent image is presented as the result of tacit experience rather than fortunate accident.
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Petzval's Portrait Lens
Petzval’s portrait lens Lens Design OPTI 517 Prof. Jose Sasian Prof. Jose Sasian Chronology • Camera obscura; Leonardo da Vinci (1452- 1519) provided the first known technical description • The idea of capturing an image • Lois Jacques Mande Daguerre (1787-1851) succeeded in finding a photographic process. This was announced in 1939 Prof. Jose Sasian Time table 1812 W. Wollaston landscape lens; 30 deg @ f/15 1825 ~T. Young, G. Airy, J. Herschel, H. Coddington 1828 Hamilton's theory of systems of rays 1839 Photography was made a practical reality 1839 Chevalier lens 1840 Petzval (Hungarian) portrait lens; 15 deg @ f/3.6 1841 Gauss’s cardinal points, focal and principal 1856 Seidel theory Prof. Jose Sasian Joseph Petzval 1807-1891 Prof. Jose Sasian Specification R +52.9 -41.4 +436.2 +104.8 +36.8 45.5 -149.5 N-crown=1.517; N-flint=1.576 T 5.8 1.5 23.3/23.3 2.2 0.7 3.6 F=100 mm Prof. Jose Sasian Petzval portrait lens could actually take photographs of people. This likely contributed to its success. It made photography a practical reality. Prof. Jose Sasian Petzval Portrait lens vs Wollanston landscape lens •F/3.6 •F/15 •Field +/- 15 degrees •Field +/- 30 degrees •Artificially flattened field •Artificially flattened field •1840 •1812 •Photography process announced •Applied to camera obscura in 1839 Petzval portrait lens could actually take photographs of people. This likely contributed to its success. It made photography a practical reality. Prof. Jose Sasian Images Object Image Prof. Jose Sasian The state of the art • Telescope doublets: Chromatic aberration and spherical aberration • Periscopic lenses in the camera obscura • Airy’s study of the periscopic lens exhibiting the trade of between astigmatism and field curvature.
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FDT Free Access
The Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmV- VVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge Format- Full FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVV- VistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFTheJon Fauer ASC Big PictureLeica FormatLarge FormatFull FrameFull Format65mmVVVistaVisionVistaVisionish24x36LFThe
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Dacora, Dacora Werk, Munchen, Germany. Daguerre, France. J.H.Dallmeyer,19, Bloomsbury St to 1889
Dacora, Dacora Werk, Munchen, Germany. Dignar f2.8 45mm It is a triplet, at least on the 1958 version. Color Subitar f2.8 45mm on Dacora CC in the early 1960's. Dignar F4.5 on Dacora Record, about 1954. Dacora Anastigmat f6.3 75mm There was also a f3.5 version. Dacora Achromat This was the low price option on the Digna and Color-Digna. Color Subitar f2.8 45mm This was fitted on many models in early 1960's. It may mark the beginning of the use of rare earth glass? These lenses seem to have been fitted to all their cameras in the 1950's, and were commonly in UK shop windows at the time. Later they seem to have used lenses from Rodenstock, such as Trinon Lanthan on the Super Dignette 500 SR and also from ISCO. Daguerre, France. His choice of the achromatic meniscus was a major factor in the early success of photography. During the development he was in contact with Chevalier regarding lenses, and after the launch, the main concern of users was the long exposures needed, up to 15min or more. These were reduced by the use of mixed halides, where Goddard (UK) and Claudet were involved, as well as probably workers in Austria. After the process was published, Petzval was asked in Austria to design a faster lens and came up with the Portrait lens, f3.7 in place of the former meniscus lenses at f11 or so. The combination of these improvements gave some 1000x increase in speed. The announcement of the process was Jan 1839, detailed in August 1839 and Goddard introduced bromine with the iodine in 1840.
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Refractive Optical Design Systems • Any Lens System Is a Tradeoff of Many Factors • Add Optical Elements (Lens/Mirrors) to B
Refractive Optical Design Systems Any lens system is a tradeoff of many factors Add optical elements (lens/mirrors) to balance these Many different types of lens systems used Want to look at each from the following Performance Requirements Resolution of the lens – how good at seeing fine details Also compensation to reduce lens aberrations Field of View: How much of a object is seen in the image from the lens system F# - that is how fast is the lens i.e. how good is the lens at low light exposures Packaging requirements- can you make it rugged & portable Spectral Range – what wavelengths do you want to see Also how to prevent chromatic aberrations Single Element Poor image quality with spherical lens Creates significant aberrations especially for small f# Aspheric lens better but much more expensive (2-3x higher $) Very small field of view High Chromatic Aberrations – only use for a high f# Need to add additional optical element to get better images However fine for some applications eg Laser with single line Where just want a spot, not a full field of view Aspheric Lens Aspheric corrects the higher order terms in the sin expansion 3 5 sin( ) 3! 5! To correct change the radius of curvature terms to higher orders Problem normal fabrication grinding easy to make spherical Much more complicated to grind the aspheric - higher costs Also difficult to combine aspherics in a system Design system with spherics then final correction with aspherics Landscape Lens Single lens but with aperture stop added i.e restriction
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Petzval's Portrait Lens
Petzval’s portrait lens Lens Design OPTI 517 Prof. Jose Sasian Chronology • Camera obscura; Leonardo da Vinci (1452- 1519) provided the first known technical description • The idea of capturing an image • Lois Jacques Mande Daguerre (1787-1851) succeeded in finding a photographic process. This was announced in 1939 Prof. Jose Sasian Announcement of the invention of the Daguerreotype by Arago at the meeting of the French Academy of Sciences and Arts August 19th 1939 Louis-Jacques- Mandé Daguerre Dominique François Arago Prof. Andreas Ettingshausen, 1796–1878 Prof. Jose Sasian Daguerre’s camera and the achromatic landscape lens ½ hour to take a picture: F/16 “It is known that the objectives used by Daguerre were achromatic plane-convex-lenses. Their plane side was turned toward the object, the convex side towards the image. They have an opening of 3 zoll, but this opening is reduced to 1 zoll by a diaphragm placed before at a distance of 3 zoll from the lenses.” J. Petzval Prof. Jose Sasian Prof. Ettingshausen asked Joseph Petzval to explore the shape of the lenses Joseph Petzval Vienna University, 19th century Prof. Andreas Ettingshausen 1807-1891 “It was in the year 1839, when the wonderful invention by Daguerre was made public, and incited the general interest to such a high degree. At that time I was first made aware of the strange shape of the objectives used in Daguerre’s camera obscura by my dear friend and colleague Professor von Ettingshausen. I was asked to explore the reason for this shape.” J. Petzval Prof. Jose Sasian Petzval Portrait Lens “Greater illumination, one of the desired improvements, can only be obtained in two ways – by enlarging the aperture and by diminishing the focal length, both which, however, will result from employing two converging lenses, instead of one.
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||||||IIIHHHHHHHHHH USOOS 4834A United States Patent (19) 11 Patent Number: 5,148,314 Chen 45) Date of Patent: Sep
||||||IIIHHHHHHHHHH USOOS 4834A United States Patent (19) 11 Patent Number: 5,148,314 Chen 45) Date of Patent: Sep. 15, 1992 54) OPTICAL SYSTEMS EMPLOYING Primary Examiner-Janice A. Howell REFRACTIVE AND DIFFRACTIVE OPTICAL Assistant Examiner-Kiet T. Nguyen ELEMENTS TO CORRECT FOR CHROMATIC ABERRATION 57 ABSTRACT Optical structures are disclosed that comprise selected 76 Inventor: Chungte W. Chen, 33 Allegheny, combinations of refractive and diffractive type optical Irvine, Calif. 92720 elements wherein net chromatic aberrational effects are 21 Appl. No.: 710,859 minimized in images formed by said structures. With the disclosed structures, chromatic aberrational contribu 22 Filed: Jun. 6, 1991 tions from each type of optical element, having charac 51) Int. Cl................................................. GO2B5/OO teristically opposite algebraic sense, are essentially can 52 U.S. C. ...................................... 359/642; 359/16; celled out by means of proper distribution of optical 359/797 power plus suitable arrangement and relative location 58 Field of Search .......................... 359/642, 797, 16 of the said optical elements. Advantages over the prior 56 References Cited art are demonstrated in four general types of optical Structures. U.S. PATENT DOCUMENTS 5,044,706 9/1991 Chen ................................... 359/356 10 Claims, 8 Drawing Sheets N s U.S. Patent Sep. 15, 1992 Sheet 1 of 8 5,148,314 Fig. 1. Fig. 3. CLASS - REFRACTIVE ACHROMAT U.S. Patent Sep. 15, 1992 Sheet 2 of 8 5,148,314 O Fig. 4d. N 3 N Fig. 5b. U.S. Patent Sep. 15, 1992 Sheet 3 of 8 5,148,314 Fig. 7b. 02 U.S. Patent Sep. 15, 1992 Sheet 4 of 8 5,148,314 E.
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Lenses the Nimrud Lens
Lenses The Nimrud lens The word lens comes from the Latin name of the lentil, because a double-convex lens is lentil-shaped. The genus of the lentil plant is Lens, and the most commonly eaten species is Lens culinaris. The lentil plant also gives its name to a geometric figure.! The oldest lens artifact is the Nimrud lens, which is over three thousand years old, dating back to ancient Assyria.[3] David Brewster proposed that it may have been used as a magnifying glass, or as a burning-glass to start fires by concentrating sunlight.[3][4] Assyrian craftsmen made intricate engravings, and could have used such a lens in their work. Another early reference to magnification dates back to ancient Egyptian hieroglyphs in the 8th century BC, which depict "simple glass meniscal lenses".[5] A simplified optical diagram of the eye. Light rays are bent when they cross from the air A human eye. The anatomy of the eye. into the eye. (A little of the incident rays' energy goes into the reflected rays rather than the ones transmitted into the eye.)! Figure 1: A Camera Obscura A simple biconvex lens was originally used to concentrate the light of these camera obscuras, but the field curvature of such a lens is so severe that only the center of the image is in focus. In 1812, W. H. Wollaston found that a meniscus shaped lens provided a much flatter field. Wollaston was already filthy rich from discovering the process for refining platinum, inventing the camera lucida, and the goniometer among other things, so he didn’t bother patenting his meniscus lens and any lensmaker could produce and sell them.
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