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Steven, thank you so much for this terrific information! It is obvious that you have great knowledge in this field. I will definitely do a lot more research following up on your lead regarding the...

Thanks so much for the information and references Steven. Looking at the catalogue thread, it is difficult for me to figure out which item is the lens that I have. Any idea, and why mine would not...

I recently acquired an L.W. Kranz lens but have no good idea of what I really have. Examples of other lenses by this maker I found on the web have a number engraved either above or below the maker's...