At 02:56 PM 5/11/2006 -0700, Jeffery you wrote:
I must point out that a lens hood will not make much difference if the lens is scratched up. The scratches act to diffuse light from the image. They will, of course, also have an effect on extra-image light, which is the only light affected by a lens hood. Scratches affect mostly the contrast of the lens, reducing it significantly. If bad enough they can also affect the sharpness. I think its a good rule to avoid scratched lenses. As I pointed out in an previous post "cleaning marks" are scratches and often very fine ones. These are quite effective in scattering light and reducing lens contrast. The term is a euphemism for scratching. Again, a single large scratch or gough may have minimal effect on the image where a number of fine scratches will destroy image contrast.
--- Richard Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx
Just a thought.