Goerz Barrel Lenses: Flange Sizes

I discovered the happy coincidence that my Goerz 12"/f:6.8 Gold Dot Dagor and 19"/f:11 Apo Artar, both in barrel, use the same flange, so I'm having Steve Grimes make me an adapter to mount either lens on the front of an Ilex #5 shutter (factory mounted, these lenses would have come in an Ilex #4, so the #5 should leave enough room for a front mount without vignetting).

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Since I'll have this adapter and barrel lenses are cheap, now I'm wondering what other lenses might be able to use this same adapter. Any Goerz collectors know the answer?

David: Probably my Goerz R18 eighteen-incher. This lens is the same

thing as an 18-inch Red Dot, and was marketed for some industrial

purposes or other.... BTW, in case anyone is interested: The proper

noun Goerz should be pronounced "gertz" (reasonable English

pronunciation). I've always assumed this, but the other day was

startled to hear the quite knowledgeable proprietor of a serious local

photog store say something like "gortz". I called my brother in law,

a native German, and he said it's "gertz". Anyone know any different?

-jeff buckels (albuquerque)

Reporting back, since some people asked how this front-mount adapter

system worked out.

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With these two lenses--Goerz 12" Gold Dot Dagor and 19" Apo

Artar on an Ilex #5 shutter--it's a good solution. Loads of room for

movements, and I get bellows impingement before I can see any

vignetting from the shutter flange.

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I'm trading some speed in setup time with this arrangement, and tilts

are slightly more complex, since the tilt axis is now further from the

nodal point of the lens, but now I can carry three or more lenses into

the field (the shutter originally contains a 10" WF Ektar) with only

one bulky shutter and lensboard. This also invites some risk, because

if the shutter jams, I'm out all the lenses that use it, but it's a

risk I can take in many cases for the advantage of having more lens

options. I might not carry so many lenses if each had its own

shutter, and I'd still be risking mechanical problems.

I asked a collector about my original question, and he said I probably

got really lucky in finding two Goerz lenses that use the same flange,

in that some Goerz lenses of the same type and focal length of

different periods don't even use the same flange. He though my best

bet would be a 10 3/4" Dagor, but that's not really a focal length I

need. I'll still keep an eye out.

On additional advantage of front mounting is that if you test your

shutter and record the resultant adjusted speeds, you will have three

lenses with exactly the same shutter speeds. I imagine that would be

especially helpful if you were shooting transparencies.