Originally Posted by
Dan Fromm
Achromatic doublet, more likely. If it is an Apo-Nikkor or similar most of the lens ain't there.
As far as I know -- could be mistaken -- the longest process lens cataloged is the 2500/12.5 Apo Saphir. I have a Boyer catalog with a picture of 13 of them and Eric Beltrando tells me that he saw a batch of 8 ready for shipment. So there at least 13 were made, possibly 21, perhaps a few more. Practically speaking the lens doesn't exist. I'd be happy if someone turns up a catalog that lists a longer process lens.
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