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.
Tag - waterhouse stops diy
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.