I am looking to purchase a used lens,a 14'' F6.3 Commercial Ektar lens. My quest ion regarding this and other used lenses is when describing it the sellers says something like "Glass is good with a few minor cleaning marks". Firstly, when i nspecting a lens what should I look for, how can I tell if the coating has been "damaged", rubbed off to some degree. Second, at what point is there too much d egradation that the coating is useless? At this point should the old coating ju st be polished off? Also, do cleaning marks effect the overall image aside from less reduction in flare? I appreciate any comments on this topic.
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