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Goerz Dagor 3 1/2" f6.8

 
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disemjg



Joined: 10 Jan 2002
Posts: 469
Location: Washington, DC

PostPosted: Sun Jun 01, 2008 3:17 pm    Post subject: Goerz Dagor 3 1/2" f6.8 Reply with quote

Can anyone tell me something about this lens? The FL works out to be about 87mm, so my guess is that it would be a normal for a 6X6 or maybe 6X7 unless I am mistaken.

Were there wide angle Dagors, and if so how were they identified?

Thanks

John
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pv17vv



Joined: 22 Dec 2001
Posts: 255
Location: The Ardennes, Belgium

PostPosted: Sun Jun 01, 2008 6:09 pm    Post subject: Reply with quote

John, have a look here :

http://www.cameraeccentric.com/html/info/goerzcata/goerzcata.html

Georges
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Dan Fromm



Joined: 14 May 2001
Posts: 1888
Location: New Jersey

PostPosted: Mon Jun 02, 2008 9:59 am    Post subject: Reply with quote

John, not to quarrel with Georges' reference, but my friend Eric Beltrando has calculated performance for Dagors and Boyer's dagor type the Beryl. See www.dioptrique.info .

Eric tells me that although manufacturers, e.g., Boyer, claim that the lenses will cover 85 degrees at f/22, in fact 70 degrees is more nearly correct and that for stringent applications, e.g., repro cameras, 50 degrees is all that one should expect. There have been acrimonious discussions of the LF forum about Dagors' coverage; go there and search for lousy Dagor if you want a good laugh.

IMO coverage is in the eye of the beholder and you'll have to ask the lens what it can do. If I had your lens I'd use it on 2x3, possibly 3x4, not 4x5.
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Mon Jun 02, 2008 7:19 pm    Post subject: Reply with quote

Wide angle Dagors are usually marked as such and are usually f9.5.
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