I have just received this lens along with a Thornton Pickard shutter, and I'm not familiar with it's design. The lens appears to be a single Plano-convex lens at the rear, and just a black disk at the front. There are no markings anywhere on the lens, or any method of setting an aperture eg waterhouse stop etc.
Does the hole in the front glassless, black disk act as an aperture? If so, I assume that it the same calculation to work out the F stop once I know the focal length?
The lens is 4cm wide by 4cm long, and the flange is integral to a sleeve in which the lens can move backwards and forwards as a crude method of focus.
Can anyone tell me what sort of angle of coverage this design of lens gave?
Thanks
Bruce
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