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CCHarrison
29-Aug-2012, 05:25
Please see

http://antiquecameras.net/bohmkelenses.html


thanks
Dan

evan clarke
29-Aug-2012, 05:43
Excellent....

Steven Tribe
29-Aug-2012, 06:43
Indeed excellent!

Without an American importer believing in advertising, this information would have never appeared.

I can understand Voigtländer's pique! Böhmke must have started his competetion during the period when Hans Sommer was developing the RRs - soon to become Euryskops. I see he even mimiked the decorative serial number. At this time, patent laws were difficult to enforce across the Atlantic.

Jody_S
29-Aug-2012, 07:34
Interesting. I have a Dagor labelled Gennert, I'm still trying to figure out who made it. I suspect it was post-Böhmke though.

E. von Hoegh
29-Aug-2012, 07:39
Interesting. I have a Dagor labelled Gennert, I'm still trying to figure out who made it. I suspect it was post-Böhmke though.

Do you have a picture you could post?

Jim Fitzgerald
29-Aug-2012, 07:54
Dan, great read thanks.

Jody_S
29-Aug-2012, 08:23
Do you have a picture you could post?

Of course.
7966079661

E. von Hoegh
29-Aug-2012, 08:51
How do you know that's a Dagor?

Steven Tribe
29-Aug-2012, 13:14
There is a 9 1/2" (240mm) Dagor (series III) but it is a No. 4.

E. von Hoegh
29-Aug-2012, 13:18
I found a mention that the Gennet Sylvar was a 3+3 anastigmat, but no info. on the construction. I have 2 series III no.4 Dagors, one a 9 1/2" and one 240mm.

Jody_S
29-Aug-2012, 16:00
How do I know it's a Dagor? I have 3 other Dagors; curves, reflections, construction, etc. appear to be identical. The photographs I take with this are very similar to the other one I've used the most, a 120mm I use on 4x5.

The VM mentions the Sylvar is a 3+3, and mentions that it might be a Dagor. I don't really care what I call it, or what name appears on the rim, I bought it to take photos and so far it is doing very well in that regard. I admit I am pleased that I may have bought a Dagor off of fleabay for $36, but that's a pretty good buy for any lens that covers 8x10 (I know there's a thread somewhere to the effect that a 9-1/2" Dagor doesn't really cover 8x10, and I fully agree with that assessment, it needs to be stopped down to f32 and the corners are fuzzy).

CCHarrison
29-Aug-2012, 16:12
Here is your Sylvar information, and yes its a 3+3 lens.

Dan

79689

Jody_S
29-Aug-2012, 16:25
Here is your Sylvar information, and yes its a 3+3 lens.

Dan

79689

I think people have taken the "Jena glass" part of that advertisement to mean that it was made by Zeiss. I don't know what other lens-makers were active in Jena, or if Zeiss sold optical glass to other manufacturers. Coverage is exactly as the price list indicates, when open my #5 vignettes on 8x10.

CCHarrison
29-Aug-2012, 16:38
Here is an entire book written on "Jena Glass (http://books.google.com/books?id=o8o3AAAAMAAJ&printsec=frontcover&dq=jena+glass&source=bl&ots=1AZT6rnLJV&sig=uJdkVaBxfSi65AkhAOL60zCLsgc&hl=en&sa=X&ei=lKY-ULWDKonw0gHHgIGwCw&ved=0CDQQ6AEwAA#v=onepage&q=photographic&f=false)" See page 95 for specifics about photographic use of Jena glass.

Dan

Dan Fromm
29-Aug-2012, 17:24
I think that Jena glass refers to glass made by Schott, see http://www.us.schott.com/english/company/corporate_history/?highlighted_text=history

E. von Hoegh
30-Aug-2012, 07:17
I think that Jena glass refers to glass made by Schott, see http://www.us.schott.com/english/company/corporate_history/?highlighted_text=history

Yes, in the early 1890s "Jena Glass" was a buzz phrase.

E. von Hoegh
30-Aug-2012, 07:36
I think people have taken the "Jena glass" part of that advertisement to mean that it was made by Zeiss. I don't know what other lens-makers were active in Jena, or if Zeiss sold optical glass to other manufacturers. Coverage is exactly as the price list indicates, when open my #5 vignettes on 8x10.

My Ser.III No.4 Dagors neither vignette nor have fuzzy corners on 8x10.

Jena glass refers to Schott Jena, not Zeiss.