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#1
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Schneider APO Artar
I've got an APO Artar Schneider 360mm F9
and I was wondering what peoples thoughts are on using it for work at less than 1:1 magnification on 4x5, landscapes, studio etc etc etc I'm thinking of getting it fitted to a Copal #3 shutter. Is it worth the expense, keep in mind that I already own the shutter, so that should cut down significantly on the expense. Thnaks Glenn |
#2
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Glenn Barry wrote:
I've got an APO Artar Schneider 360mm F9 and I was wondering what peoples thoughts are on using it for work at less than 1:1 magnification on 4x5, landscapes, studio etc etc etc I'm thinking of getting it fitted to a Copal #3 shutter. Is it worth the expense, keep in mind that I already own the shutter, so that should cut down significantly on the expense. This is a dialyte type lens, one of the best constructions of it's type. It has a rather narrow angle of view (the useable diameter is about the same as the focal length at infinity), so this one is suitable for 8x10". The dialytes (other examples are the Apo-Ronars) have excellent quality even when used at infinity. Martin |
#3
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Glenn Barry wrote:
I've got an APO Artar Schneider 360mm F9 and I was wondering what peoples thoughts are on using it for work at less than 1:1 magnification on 4x5, landscapes, studio etc etc etc I'm thinking of getting it fitted to a Copal #3 shutter. Is it worth the expense, keep in mind that I already own the shutter, so that should cut down significantly on the expense. This is a dialyte type lens, one of the best constructions of it's type. It has a rather narrow angle of view (the useable diameter is about the same as the focal length at infinity), so this one is suitable for 8x10". The dialytes (other examples are the Apo-Ronars) have excellent quality even when used at infinity. Martin |
#4
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I've got an APO Artar Schneider 360mm F9
Just about any lens will be an APO at f-9 because of the large depth of focus at f-9. The word APO only means something at say f-2 or even maybe f-4. Larry |
#5
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HUM????? Define "APO" then.
In article , (Hemi4268) wrote: I've got an APO Artar Schneider 360mm F9 Just about any lens will be an APO at f-9 because of the large depth of focus at f-9. The word APO only means something at say f-2 or even maybe f-4. Larry -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#6
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"Hemi4268" wrote in message ... I've got an APO Artar Schneider 360mm F9 Just about any lens will be an APO at f-9 because of the large depth of focus at f-9. The word APO only means something at say f-2 or even maybe f-4. Larry How about lateral color, which is a difference in image size with color of light. The stop has no effect on this. Stopping down will reduce the effect of longitudinal chromatic aberration but will not eliminate it. Also remember that chromatic aberration also affects the correction of other corrections such as spherical aberration so the above is only partially true. -- --- Richard Knoppow Los Angeles, CA, USA |
#7
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"Hemi4268" wrote in message ... I've got an APO Artar Schneider 360mm F9 Just about any lens will be an APO at f-9 because of the large depth of focus at f-9. The word APO only means something at say f-2 or even maybe f-4. Larry How about lateral color, which is a difference in image size with color of light. The stop has no effect on this. Stopping down will reduce the effect of longitudinal chromatic aberration but will not eliminate it. Also remember that chromatic aberration also affects the correction of other corrections such as spherical aberration so the above is only partially true. -- --- Richard Knoppow Los Angeles, CA, USA |
#8
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"Glenn Barry" wrote in message u... I've got an APO Artar Schneider 360mm F9 and I was wondering what peoples thoughts are on using it for work at less than 1:1 magnification on 4x5, landscapes, studio etc etc etc I'm thinking of getting it fitted to a Copal #3 shutter. Is it worth the expense, keep in mind that I already own the shutter, so that should cut down significantly on the expense. Thnaks Glenn The Goerz, later Schneider, Apochromatic Artar is of a type (Dialyte) which holds its corrections very well with change in object distance. The older versions are all optimised for 1:1 magnification, i.e., equal object and image distances, the later "Red Dot" version was supplied with some modification of element spacing to optimise it for middle distances, the change varying with focal length and depending on whether the lens was originally supplied in a barrel or a shutter. The main aberration that shows up at infinity focus is some coma. When the lens is stopped down, perhaps two stops, the coma disappears. Coverage is comparitively limited for this type. The best image is confined to an angle of about 45degrees at infinity focus but in practice the lens will cover a diagonal equal to its focal length. The image quality falls off very rapidly beyond this and is not increased by stopping down. I have a couple of Apochromatic Artars, both quite old (about 1930) and an early Red Dot (1956, I think). Both are among the sharpest LF lenses I've ever seen. Lenses of this general type were the most often used as process lenses for photomechanical reproduction, they were sold under many names. The Goerz Apochromatic Artar was the most popular of all, at least in the U.S. The cell spacing is critical so make sure that whoever does the remounting knows their stuff. -- --- Richard Knoppow Los Angeles, CA, USA |
#9
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"Glenn Barry" wrote in message u... I've got an APO Artar Schneider 360mm F9 and I was wondering what peoples thoughts are on using it for work at less than 1:1 magnification on 4x5, landscapes, studio etc etc etc I'm thinking of getting it fitted to a Copal #3 shutter. Is it worth the expense, keep in mind that I already own the shutter, so that should cut down significantly on the expense. Thnaks Glenn The Goerz, later Schneider, Apochromatic Artar is of a type (Dialyte) which holds its corrections very well with change in object distance. The older versions are all optimised for 1:1 magnification, i.e., equal object and image distances, the later "Red Dot" version was supplied with some modification of element spacing to optimise it for middle distances, the change varying with focal length and depending on whether the lens was originally supplied in a barrel or a shutter. The main aberration that shows up at infinity focus is some coma. When the lens is stopped down, perhaps two stops, the coma disappears. Coverage is comparitively limited for this type. The best image is confined to an angle of about 45degrees at infinity focus but in practice the lens will cover a diagonal equal to its focal length. The image quality falls off very rapidly beyond this and is not increased by stopping down. I have a couple of Apochromatic Artars, both quite old (about 1930) and an early Red Dot (1956, I think). Both are among the sharpest LF lenses I've ever seen. Lenses of this general type were the most often used as process lenses for photomechanical reproduction, they were sold under many names. The Goerz Apochromatic Artar was the most popular of all, at least in the U.S. The cell spacing is critical so make sure that whoever does the remounting knows their stuff. -- --- Richard Knoppow Los Angeles, CA, USA |
#10
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"Hemi4268" wrote in message
... I've got an APO Artar Schneider 360mm F9 Just about any lens will be an APO at f-9 because of the large depth of focus at f-9. The word APO only means something at say f-2 or even maybe f-4. Aside from the fact that "Errr, no...", a 350mm on 10x8 doesn't exactly have a _whole_ lot of DoF even at f9. Peter |
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