Discusses the adaptation and use of large-format lenses with full-frame or smaller digital cameras. Concepts of circle of confusion, focal length and angle of view are reviewed as a basis to theoretically understand the reason for the loss of sharpness in the images thus produced.
Article shows a retouching desk of the type used at the beginning of photography. The retouching was done basically with pencil applied directly on the photographic emulsion. Examples of... +
Article addresses the technical and historical aspects of the first lens actually thought, calculated and developed for photography, in 1840 by Joseph Petzval.
Lens from Carl Zeiss, designed in 1890/ These samples were produced in 1926/7. The Protar V is an super wide angle lens capable of excellent results although very small and light weight. A... +
Falling Plate, the first cameras for hand held shooting
Since its invention photography was synonymous with tripod, black cloth and ground glass. The new category that emerged in the late nineteenth century, shortly after the invention of silver gelatin emulsions, added the much quicker, and sometimes indiscreet, instant photography. Loaded with 12 glass plates, they used distance-scale focus and optical viewfinder framing. Also known as detective cameras, magazine cameras or simply hand cameras, because “hand” photography was still new, they opened new horizons for photography. read more …
Horizont from KMZ, a panoramic camera with swing lens
The concept of sweeping a scene with a rotating lens was introduced very early in photography. It has its own advantages, disadvantages and characteristics if compared to the simple use of a wide angle to produce panoramic pictures. Understand what happens optically and how to explore both systems. read more…
Super Angulon f/5.6 – Schneider Kreuznach
Launched in the 60’s, the Super Angulon is one of the best wide angle lenses ever made. It covers 13 x 18 cm, if one wants to use its 105º angle of view. But fitted to a 4×5″ camera, like a Linhof Technika, it allows plenty of movements and is capable of superb results. read more …
Manoeuvres with a Petzval type portrait lens
With modern lenses it is possible to focus on any part of an image and get a sharp spot while keeping composition as it pleases us. With old lenses, Petzvals for instance, even adjusting the best focus, the peripheral parts of an image will never come out sharp, unless we stop down the lens. This article discusses how to use a large-format camera for situations where the subject we want sharp is far from the optical center of the lens and we want it fully open. read more …
Objectif Achromatique – Lerebours et Secrétan ~1855
This is a lens that probably made some daguerreotypes more than 160 years ago. A doublet with a diaphragm at the front and has for decades been the preferred lens for landscapes. In this article you will learn the story of one of the pioneering makers of photography: Noël-Marie Lerebours, who was also a publisher and daguerreotypist in Paris. See a recent photo taken with this lens having as support an 18 x 24 cm dry plate. read more …
Understand focal length, angle of view and image circle
How can a 300mm lens be wide-angle and another 300mm lens be considered long focus? In this article you will learn or review the three basic parameters that define a lens: focal length, angle of view and image circle. You will be able to understand and evaluate the use of any lens for any format. leia mais…
Complete tutorial for building a device that allows you to make sun exposures with the same amount of UV radiation even at different times and atmospheric conditions. Useful for cyanotype, gum bichromat, salted paper and other historical photographic printing processes.
Complete and detailed tutorial for you to produce a magnetic stirrer. It is an invaluable aid for preparing solutions in analog photography, such as developers and fixers. Assembly is very simple and uses low cost components.
Complete project for the construction of a photographic amplifier head using RGB LEDs. Includes your timer / mixer. It allows the use of multi-contrast papers and can be fixed on a 4x5 camera for use as an amplifier.
Tutorial shows you how to spot retouch black and white photos either by chemical reduction, or by depositing pigments to darken small areas. Procedure can be used for fault correction or creatively as photograph interventions. Example shows how to enhance catchlights.
Article shows how you can change the perspective of an enlargement by tilting the easel in the analog photo lab
This video-complete tutorial presents a photo retouching technique that aims to lighten up areas of a photograph using a Potassium Ferricyanide reducer.
Full description of the method for retouching black and white photographic negatives. The technique described is the same as that used from the beginning of silver gelatin emulsions. Very effective for smoothing and correcting, especially portraits.
Complete tutorial about how to cut 120 to 127 film format and spool it into a 127 film reel. Materials, devices, video and measurements, everything you need to know to use again your cute Baby 127 camera.
Tutorial with video for building up a photography contact printer. That can be used for large format photographs and also for UV alternative/historical processes like Van Dyke Brown, Cyanotype, Gum Dichromate, Salted Paper, Platinum/Palladium among others.
Tutorial shows step-by-step and constructive details to make a large format camera back to work with standard film holders, sizes 4x5" and 9x12 cm.
Application creates a .pdf for a bellows used on photo cameras of any size. The drawing indicates the cut-and-fold lines in life size. You indicate the measures, pay via Pay Pal and receive the project by email within a few minutes.