Archived posting to the Leica Users Group, 1997/12/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From Jeff Moore's post: >I'll have to go over >this puppy with a fine-tooth comb, and see what a test roll reveals. > > -Jeff To see if any trace of a coating flaw shows through, I'd photograph an evenly lit, textureless medium gray card at the smallest aperture. The smallest aperture gives the thinnest bundle of light rays to form each point on the film. For this reason, any density variation due to a surface flaw will be projected over the smallest area and therefore will be at its most obvious. At larger apertures, each point on the film receives light from the whole aperture area and so a small flaw will be hidden. Also test with light striking the front lens element for flare. Nick Hunter