Originally Posted by
goamules
"He has someone who is willing to try and make him a new element, but he needs the specifications for it."
The specifications for a petzval should be in lots of optical writings, it was a mathematical formula. But based on the refractive indexes of the two types of glass.
Is his person an optical engineer or manufacturer? Because if he wants to actually use the lens, not sell it to some sucker, the cost of making a rear group from scratch that is any good will be a lot more than the lens is worth. The sharpness of a lens with the rear made by a novice will be pretty suspect.
Voigtlander Serial No. 16673 it appears to be, if it every shows up on the market, buyer beware.
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