Questions about a Goerz Dagor 6 in lens

hello,

 

i just purchased a goerz dagor lens. i was wondering if anyone has information about it.

 

heres what it reads around the lens: Goerz opt. co. inc, Dagor 6in f/6.8 (black rim)

 

 

serial number is: 819XXX

 

is this lens coated? and what is the coverage?

 

 

 

 

one more question, whats the difference between REPRO claron and a G claron lens?

 

 

thank you for your help

Your second question: the biggest practical difference between the Repro-Claron and the G-Claron is that the G-Claron has a lot more coverage. The Repro-Claron has a design of four air-spaced elements, the same as the better known Apo-Ronar and Apo-Artar. There are two versions of the G-Claron. The latter and more common one is a plasmat, with six elements in six groups -- coverage is wide. Also, the Repro-Claron uses thorium glass and so is slightly radioactive.

 

There are many discussions in the archives on these lenses, esp. on G-Clarons. You can also find information on these lenses on Schneider's websites, either the English or German language sites.

<a href=http://www.largeformatphotography.info/classic-experts.html> Goerz Lens info at A Large Format Photography</a>. The serial numbers listed suggest yours is a late 50's or early 60's. <br>Look at the glass, if it is purple or blue tint then it is coated, if it is clear it is not coated.<br>There are a few Goerz catalogs posted at <a href=http://www.cameraeccentric.com/html/info.html> The Camera Eccentric </a>. The only coverage info I can find is for the Gold Dagor and for 150mm f6.8 it is 210mm.

Stopped down to f45 the coverage of a Dagor is roughly 87 degrees, or 285mm for your 6"

lens. Attached is a Dagor coverage chart, I am not sure where it came from, so apologies to

who ever scanned it.

It is a 6 element made of 2 symmetricl cemented triplets. It covers 65 degrees and normally has very good quality. On 4x5 it will give you some swings and tilts.

 

Lynn