"Back focus"? I would assume the focal length is around 10" - 240mm to 300m max. Back focus isn't all that helpful.Originally Posted by CCHarrison
"Back focus"? I would assume the focal length is around 10" - 240mm to 300m max. Back focus isn't all that helpful.
""Back focus isn't all that helpful
It is when the barrel has been shown alongside a tape measure.
Early listing of focal lengths in adverts often gave the, easier measured, back focus.
14" + 3 1/2" gives the eq. focal length of 17 1/2".
I have an voigtlander portrait objective 7 that look a lot like this one. its my favorite lens ever. Great find.
Back focus is VERY helpful when the catalogue tells you what it is.
The focal length for this number 7 model is listed as 17.72 inches or 453mm - see catalogue entry below
Dan
Antique & Classic Camera Blog
www.antiquecameras.net/blog.html
..and now on ebay! At least the seller was well informed.
Rule of thumb: A brand new member asks specific hardware questions, which are dutifully answered in detail and at length, with no followup question or thanks from the OP = gathering data to market something. This applies to all hobby websites.
Garrett
flickr galleries
How much cut did everyone get?
http://www.ebay.com/itm/181068874038...84.m1438.l2649
"Sex is like maths, add the bed, subtract the clothes, divide the whoo hoo and hope you don't multiply." - Leather jacket guy
2/5ths as fast? So How fast is it? Thanks!
So is this one a 7A? ebay # 121063046400 - Just trying to gain some knowledge!
Gundlach
The closest catalogue entry to what the seller stated as specs is the #9 model which is listed as 676mm covering 17x20
Dan
Antique & Classic Camera Blog
www.antiquecameras.net/blog.html
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