Angle of View for a photographic lens based on image circle and focal length

Result is presented in degrees.

Dry plate and film negative retouching
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. […]
Measuring lens aperture
Article explains a method for evaluating lens aperture without dismantling the lens. It can be also the basis for calculating diaphragm diameters for Waterhouse stops according to a desired apertures scale. […]
Build your 4×5″ camera back
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. […]
Making new roller-blind shutter cloth
Many old large format lenses, which are very […]
Magnetic Stirrer
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. […]
Ground glass loupe, easy and useful
Quite often we want to check focus more carefully in a […]