ron_lamarsh

Hi I have the opportunity to purchase a goertz artar(red dot 8.25")in a copal shutter. The seller informs me that it has slight polishing marks. How much will this affect the lense performance I am on a rather tight buget and need to get the most bang for my buck and am not all that interested in resale value. They only want $189.00 got any advise? Thanks

I need some opinions on how much effect things like cleaning marks etc have on image quality. I use 4x5 and enlarge to 11x14 and shoot almost all B&W. The cleaning marks I'm talking about are on the rear element and can only be seen with a 7x loupe while pointing the lense directly at a quartz halogen lamp about 6in away.

I know that any kind of scratch or other imperfection will have an effect on contrast but does anyone know or have an opinion as to how much? I recall reading something written by Ansel himself stating that even a visible scratch on the rear element would probably not have much of an effect unless struck by direct bright light!

I am of the opinion that such minor imperfections have more of an effect on value than actual image quality as long as you're not enlarging a 4x5 to 5ftx7ft. Any other opinions?

Also has anyone ever heard of or read anything about computar symmatrigons?

I would suggest reading "the Art of Black and White Photograpy" by David Vestal. He has an excellent system for establishing a "norm" for b&w roolfilm. Alsoi his book the ART of black and white enlarging has an even better and simpler system that will enable you to get great results without becoming a sensitometrist> Good Lcuk And Happy Shooting.