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pkrpkr
16-Dec-2019, 13:42
Anyone have more info so I can pin down the date of this casket set?
A similar set is mentioned in a 1889 catalog from Charles Fabre, so it must have been around then.
It is a No.1 set by C. Berthiot, number 20424. The focal length seems to be 22cm and 14cm (14 c is marked on one of the elements too).
Thanks in advance for any help,
Peter
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Dan Fromm
16-Dec-2019, 14:10
P-H Pont's Berthiot chronology puts 25,000 around 1900. This would probably put your lens around 1895-6.

pkrpkr
17-Dec-2019, 07:25
Thank you Daniel!
BTW just found your publication about anastigmats - excellent work and thank you for making it!