I recently "found" this Darlot Cone
It is dated 1862 (on the glass) and it measures about 20 1/2 inch focal lenght
So it will be around f6. How much will it cover wide open ?
lenght is about 33cm (without knob) which is about 13 inches.
So show the size it photographed it beside my 3b
Can anyone give me some more info about these lenses ?
Had a quick search on the WWW, but these is not much info available.
Thanks
Alex
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