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#1
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Hugo Meyer convertible plasmat lens
Hello,
I have got old large format stuffs from my grand uncle. Within this "package" there is a lens from I don't know anything about. Here are all the informations I picked up by inspection. The cell mounted on the front is engraved "Plasmat lens 1:8 foc. 6 3/4 inch Nr 782213" The cell mounted back is doubled engraved "Plasmat lens 1:11 foc. 9 1/16 inch" and "Plasmat set 1 1:45 foc. 4 7/16 inch Hugo Meyer & Co Goerlitz New York Nr 782213"" The shutter is engraved "F.Deckel - Munchen" and has 3 aperture scales : one 4.5, 5.6, 8, 11, 16, 22, 32 one engraved "BL" is 8, 11, 16, 22, 32 one engraved "FL" is 11, 16, 22, 32 Anybody could help me to find the right cell combinations for the right focals and tell me if they cover 4x5 format ? jean-bernard -- Message posted via http://www.photokb.com |
#2
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"Roux Jean-Bernard via PhotoKB.com" wrote in message . .. Hello, I have got old large format stuffs from my grand uncle. Within this "package" there is a lens from I don't know anything about. Here are all the informations I picked up by inspection. The cell mounted on the front is engraved "Plasmat lens 1:8 foc. 6 3/4 inch Nr 782213" The cell mounted back is doubled engraved "Plasmat lens 1:11 foc. 9 1/16 inch" and "Plasmat set 1 1:45 foc. 4 7/16 inch Hugo Meyer & Co Goerlitz New York Nr 782213"" The shutter is engraved "F.Deckel - Munchen" and has 3 aperture scales : one 4.5, 5.6, 8, 11, 16, 22, 32 one engraved "BL" is 8, 11, 16, 22, 32 one engraved "FL" is 11, 16, 22, 32 Anybody could help me to find the right cell combinations for the right focals and tell me if they cover 4x5 format ? jean-bernard -- Message posted via http://www.photokb.com The Plasmat is the grandfather of nearly all the current large format camera lenses and nearly all current enlarging lenses. It was derived from the well known Dagor by air spacing the inner elements. The design is variously attributed to Paul Rudolph, the inventor of the Tessar and Protar, and to Ernst Arbeit of Hugo Meyer. The Plasmat is a six element lens with the outer components consisting of two cemented elements and single, air-spaced element closest to the stop. The cells can be used individually with loss of some sharpness compared to the complete lens. The information for this lens is included in the engraving. The focal lengths are speeds a Complete lens: f/4.5, FL 4-7/16 inches Back lens alone: f/8, FL 6-3/4 inches Front lens alone: f/11 FL 9-1/16 inches The marking 1:45 is actually 1:4.5 and is the speed of the complete lens, i.e., f/4.5 The Plasmat is an inherently wide angle lens and should cover about 75 degrees stopped down to f/22 or less. The angle of view for a 4-7/16 inch lens for 4x5 is about 68 degrees so the lens will cover as a medium wide angle lens. The coverage of the single cells is less but the longer of the two should cover and the shorter one might also. The shutter markings are the f/stop scales for the three conditions: either of the two cells when used alone, and the entire lens. While the Plasmat can be very highly corrected the design was not popular until good lens coatings became available after WW-2 due to its having 8 glass-air surfaces with resulting relatively high flare. Fredrick Deckel, of Munich, manufactured the very well known Compur and Compound shutters. Either is very rugged and can be brought to life by a proper cleaning. Goerlitz is the town in Germany where Hugo Meyer was located. This was in the Russian zone after the war. New York indicates it was imported for sale in the USA, Meyer did not have manufacturing facilities here. Unfurtunately, I have no serial number data for Meyer lenses. BTW, one occasionally encounters "Carl Meyer" lenses. This is an invented brand (mixing Carl Zeiss and Hugo Meyer) used by Burke & James, of Chicago, for lenses assembled from surplus parts. These are of highly variable quality. Hugo Meyer was a well respected optical house in its lifetime and made some excellent lenses. -- --- Richard Knoppow Los Angeles, CA, USA |
#3
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"Roux Jean-Bernard via PhotoKB.com" wrote in message . .. Hello, I have got old large format stuffs from my grand uncle. Within this "package" there is a lens from I don't know anything about. Here are all the informations I picked up by inspection. The cell mounted on the front is engraved "Plasmat lens 1:8 foc. 6 3/4 inch Nr 782213" The cell mounted back is doubled engraved "Plasmat lens 1:11 foc. 9 1/16 inch" and "Plasmat set 1 1:45 foc. 4 7/16 inch Hugo Meyer & Co Goerlitz New York Nr 782213"" The shutter is engraved "F.Deckel - Munchen" and has 3 aperture scales : one 4.5, 5.6, 8, 11, 16, 22, 32 one engraved "BL" is 8, 11, 16, 22, 32 one engraved "FL" is 11, 16, 22, 32 Anybody could help me to find the right cell combinations for the right focals and tell me if they cover 4x5 format ? jean-bernard -- Message posted via http://www.photokb.com The Plasmat is the grandfather of nearly all the current large format camera lenses and nearly all current enlarging lenses. It was derived from the well known Dagor by air spacing the inner elements. The design is variously attributed to Paul Rudolph, the inventor of the Tessar and Protar, and to Ernst Arbeit of Hugo Meyer. The Plasmat is a six element lens with the outer components consisting of two cemented elements and single, air-spaced element closest to the stop. The cells can be used individually with loss of some sharpness compared to the complete lens. The information for this lens is included in the engraving. The focal lengths are speeds a Complete lens: f/4.5, FL 4-7/16 inches Back lens alone: f/8, FL 6-3/4 inches Front lens alone: f/11 FL 9-1/16 inches The marking 1:45 is actually 1:4.5 and is the speed of the complete lens, i.e., f/4.5 The Plasmat is an inherently wide angle lens and should cover about 75 degrees stopped down to f/22 or less. The angle of view for a 4-7/16 inch lens for 4x5 is about 68 degrees so the lens will cover as a medium wide angle lens. The coverage of the single cells is less but the longer of the two should cover and the shorter one might also. The shutter markings are the f/stop scales for the three conditions: either of the two cells when used alone, and the entire lens. While the Plasmat can be very highly corrected the design was not popular until good lens coatings became available after WW-2 due to its having 8 glass-air surfaces with resulting relatively high flare. Fredrick Deckel, of Munich, manufactured the very well known Compur and Compound shutters. Either is very rugged and can be brought to life by a proper cleaning. Goerlitz is the town in Germany where Hugo Meyer was located. This was in the Russian zone after the war. New York indicates it was imported for sale in the USA, Meyer did not have manufacturing facilities here. Unfurtunately, I have no serial number data for Meyer lenses. BTW, one occasionally encounters "Carl Meyer" lenses. This is an invented brand (mixing Carl Zeiss and Hugo Meyer) used by Burke & James, of Chicago, for lenses assembled from surplus parts. These are of highly variable quality. Hugo Meyer was a well respected optical house in its lifetime and made some excellent lenses. -- --- Richard Knoppow Los Angeles, CA, USA |
#4
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You may encounter modern lenses referred to as Plasmats because they are
descendents of the lens you have. Typical examples are theRodenstock Sironar andthe Schneider Symmar and G-Claron. The latter lens being designed for close up work I own a 150mm G Claron. I can't say what the lens is like yet because it is away for attention. The Plasmat is a relative of the Goerz Dagor with a seperated inner element to eliminate the focus shift of the Goerz lens. I also have a Dagor and that has to be focused at the working aperture. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.802 / Virus Database: 545 - Release Date: 26/11/2004 |
#5
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