Hi, could somebody please explain me how to translate the following f/stops written on the barrel of an old american Petzval:
1 2 4 8 16 22
Thank's a lot in advance
Torsten
Hi, could somebody please explain me how to translate the following f/stops written on the barrel of an old american Petzval:
1 2 4 8 16 22
Thank's a lot in advance
Torsten
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