I have one and I have used it for Table Top Work. I is very nice for that. The large apature is a great help in focusing.
They were origionally designed to Take Photographs of an Oscilliscope ...
Type: Posts; User: Michael Phifer; Keyword(s):
I have one and I have used it for Table Top Work. I is very nice for that. The large apature is a great help in focusing.
They were origionally designed to Take Photographs of an Oscilliscope ...
The Dates are about Right. According to Kingslake, "A History of the Photographic Lens" The Double Anastigmat Goerz Name was reduced to the DAGOR acronym in 1904. Hope this helps... Mike
The Paragon is (most likely) a Tessar design as well. Kingslake has it listed as one in his book "History of the Photographic Lens (p 88)".
Hope this is of some help, Mike
I have been using the method and values that Robert Zeichner describes, since I read about it a few years ago in Photo Techniques. I thought the focus spread, a perture values (0.7mm=f16; 1.3mm=f22;...
I am not supprised, and am very glad to have someone like Bob Salomon (Still) ve ry interested and involved in LF.
We should all be thankfull for this.
Mike Phifer
There is a very good series of (Three) articles on the subject of "BOKEH" (From the Japanese katakana characters "bo" and "ke", which mean "out-of-focus blur") in theMay/June 1997 issue of Photo...
Michael, Getting back to you on "How Good are they?" I do not have first hand kn owledge of their performance. However, from the looks of the cut away views, the y have the potential to make very...
Mike, Ihave an old reference (Berfore Web). I hope it is what you are loking for . From the 1939 Handbook of Photography, Henny and Dudley, McGraw - Hill, 1939. (A great Reference by the way)
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Tito,
Always good to read your replys, I am glad to have been of some help in return.
I like my Meyer Aristostigmat on my 4x5 it is plenty Sharp at f16. I know that K odak Advertized the wide...
Sounds like it could be a Metrogon or Topogon. These were extreme examples of th e double-Gauss design (Four air spaced Meniscus-lenses). These ultra wide lenses were used for many years as the...
Dave and Allen, I have a Pre 1920 , 7 in Dagor that I love. (I also would love t o have your 12 in). The Glass is quite Sharp at working Apatures, f16 or smaller . FYI,The Series # has nothing to do...
According to one of my sources "Handbook of Photography, Henny - Dudley, 1939 Mc Graw-Hill", two Wollensak lenses @ f6.3 are listed. The Velostigmat 1a: Field Coverage = 63 Degrees The Velostigmat 4...
Kingslake in, "A History of the Photographic Lens" Academic Press 1989. , has a couple of references to the Pinkham and Smith of Boston Portrait lens. T here is not much company history sited...
The Radar is a variation of a Tessar Design. It has a cemented triplet rear elem ent instead of a doublet. Gundlach-Manhattan Co, Rochester, NY, claimed a slight ly wider field of 62 degrees vs 60...
Lee Chen Wah, They do this because Shimming is cheaper than Machening the dimens ions necessary for each lens. These (Biotar) designs are very sensitive to eleme nt spacing. Viewing the arial image...
Alan, I built a version using Phil Davi's Books as a guide. It uses my Pentax sp ot meter. It has worked well for me in both Reflection and Transmition. Cost me about $10 to make.