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

Derogy - Rapide n4 - Petzval typeWith 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…


Contact printer

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.

Bellows project tailor-made for you

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 a Petzval lens for potraits

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 – cost of photographic...

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...

Mix your formulas – black and white...

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.

Enlarger head using LEDs

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.

Using RAW format in photography

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.

Color Depth in digital image files

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...

Finding the focal length of a lens

  This is a calculator that will help you in finding the focal length of a photographic lens. The method is about focusing on one or more objects at different distances. Each time, you write down 3 measurements: Object size Image size How much did you advance the lens from infinity position in...

Pinhole, where truth, beauty and goodness...

Pinhole is a photographic technique that employs most of the times a home made camera in different degrees of improvisation and roughness. Matchboxes, shoeboxes and whatever boxes and containers are sort of starting point for those projects. The photographer bricoleur may also start from scratch by...