Goerz Dagor 168mm f6.8 lens

I have one of these, yes, it covers 8x10. It's the only Dagor I have used, and I haven't used it very much, so I can't say how it compares.

 

I have it too. Very nice lens for alt processes, I made cyanotype still life in my gallery with it. If wide open it has some sort of glow which might have influence on density (pardon my eng.).

Cheers,
Ugo.

 

A normal Dagor (Goerz AM Opt) 165mm will cover 7"x9" @ f45 and 5"x8" @ f16, the much later AM Opt 6½" WA Dagor only covers 10x8 @f45t, so I think your German 168mm will be quite similar to the US 165mm in it's coverage.

Ian

 

I have one also, but in an empty Compur. The cells have special threads, so it seems impossible to find another shutter for them. How good is the lens, really? Is it worth to have a "new" shutter machined to fit the cells?

 

My 12" Dagor (Goerz AM Opt) is wonderful, but how much I'd spend on re-shuttering another I'm not sure

I'd test it first using a Packard or Thornton Pickard shutter, but does yours have the aperture control still. You are caught by the lack of a standard in older Compurs.

Ian

 

Darn, I always forget that my father can make adapters for me if I can persuade him to visit his old workplace. I would get them free.

Yes, the Compur still has the aperture mechanism, so maybe I should try it with slow film, as Anton suggests. I could use a loose fitting lens cap, remove it for exposure, and then cover the lens with my hand and slide the darkslide back.

I have two Dagors in working shutters, one 10 and one 13cm, plus a Steinheil Orthostigmat 13,5cm, Zeiss Doppel-Amatar 13,5cm and a RÜO Iricentor 18cm, so I'm in no hurry - but it doesn't feel good to have a lens I can't use.

 

I talked to him yesterday about it. He's very reluctant, but agreed to take a look at the lens cells and shutters.

 

Goerz 168mm Dagor Sample Images?

I just picked up one of these at a local antique shop and was wondering if anyone has any sample images? There's quite a bit of info on them including that they cover 8x10s, I'd like to see what they do before sticking film through a camera.

 

illumiwhatsit, David, are you sure that a 168/6.8 Dagor will cover 8x10? Cover as in put good image in the corners, not cover as in put light in the corners.

I have two reasons for asking. The first is a long and hilarious thread on the LF forum -- here's the link http://www.largeformatphotography.info/forum/showthread.php?t=13109&highlight=lousy+dagor -- about whether a 7"/6.8 Dagor will cover 8x10. The second is calculations my friend Eric Beltrando, who's written a ray-tracing program and uses it to evaluate old lens designs, did on several generations of Boyer Beryl prescriptions. The Beryl is a Dagor clone, the Beryl prescription's in the parts of Boyer's archives that Eric has are uncannily close to prescriptions for Dagors in Goerz' patents. Eric has told me that Beryls are good for 70 degrees (not the 84 or so needed for a 168 to just cover 8x10) for non-critical work and for only 50 degrees for critical work.

Cheers,

Dan

 

@Dan Frommwhatsit - I don't really care whether it covers 8x10, primarily because I don't currently have an 8x10 to test it on. I was just wanting to know whether someone had digitized examples of what the lens looks like.

Ps. Sorry if my screen name confuses you.