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gchu1970
6-Aug-2009, 10:48
I recently got a protarlinse in compound shutter. The lens has sequential serial number with F=250mm of each group. I did not find data on Zeiss lens brochure. Would appreciate anyone can help me to identify the combination focal length?

Jon Wilson
6-Aug-2009, 20:20
this thread might help.
http://www.largeformatphotography.info/forum/showthread.php?t=47813&highlight=protar

gchu1970
8-Aug-2009, 08:09
I checked many sources and zeiss brochures, but did not found any information of F=250mm protarlinse. I don't know why? Anybody can help to explain? And there is no information about the combination focal length. Please help.

Archphoto
8-Aug-2009, 09:23
The F could stand for focal lengh: just put the lens on the camera, focus at infinity and measure the distance between the GG and the aperture.
This should give you a rough indication of the focal lengh.
Some mm diference will not make that much diference in what angle you of view you will get and in that way you know a bit what you can do with the lens.

Peter

Bernard Kaye
9-Aug-2009, 17:54
Do they say which Protarlinse:
e.g.: VII or IV or other? They often do but not always.
Bernie