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.
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... +
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 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.
Using Petzval-type lenses for portraits when the subject's face is out of the center of the image requires some care. The article discusses and gives an example of how to decentralize the lens to reposition its optical axis over more peripheral areas of the photographic frame.
Calculator for easy assessment of photographic formula's cost. You enter quantities, dilution, packaging and price and get right away how much one liter of that working solution costs. Very convenient to compare different formulas, purchased ready to use or homemade, and decide what suits you best...
Find a compact set of chemical reagents, 8 in total, that will allow you to develop film and print B&W photographies. With instructions about mixing, using and cost considerations. A nice starting point if you are interested in setting up a photography darkroom and make your own chemicals.
Article presents project to build a black and white photo enlarger head, with timer, using LEDs and Arduino platform. The result is high power and excellent contrast control for black and white work.
Article analyzes a practical case in which the use of RAW file, thanks to its greater depth of color, allows the exploration of areas of a photograph that in format .jpg would be lost.
Article explains why and how color-depth concept is necessary to express the array of different colors a digital system can handle. It clarifies why it must be expressed in bits, what that means in terms of color differentiation, when true-color is reached and why sometimes more than true color...
Exhibition Review: discusses relationships between the technical features of the legendary Leica camera with aesthetics and new subjects in history of photography.