Baush and Lomb Petzval

[pierre salomon]

Hi All
After a week of searching and reading I still cannot find the answer to my question: Is there any major optical difference between No 2A and No 1AA of this B&L magic lantern lens made for Edison Manuf. Co. similar to this photo? As usual I"ll be delighted to share your knowledge.
Regards
Pierre Salomon

[Steven Tribe]

You are about to be moved to the lens sub-forum by someone who decides these things.

Unless someone has a big collection of these or old internal documents from B & L, I fear an answer will not be forthcoming.
Usually, the numbers with one two or three "As" are intermediate sizes between 1 and 2, 2 and 3 etc. But B&L might be different.

[pierre salomon]

Thank you Steven.
Pierre