On Thu, 25 Aug 2005, mike wilson wrote: > They don't need to have a curve on them to act as a lens. If a light > ray is hitting them at an angle, it will be deflected by refraction. > http://www.ps.missouri.edu/rickspage/refract/refraction.html > Would make all the difference between a sharp and soft image.
Mike, Yesssss, I do happen know a smidge about refraction(*). But tell me about those filters everyone puts in front of their lenses... or do they not have the same effect? :-) Is it only at the rear of the lens you reckon it makes a difference? But that brings out the scientist in me. It would be an interesting to place a small, flat disk of optical glass at the rear of (say) the Pentax 24mm f/2.8 - you're saying it should have some effect at higher incidence angles (i.e. the edges of the frame)? (*) there's a touch of irony in there. Chris
