I always wanted the M, but newer saw it around.What I know about the Kowa 250 and 500 you need the Kowa six M with mirror lock up. The standard Six has a lot of mirror vibration. The Super 66 has better damping and the mirror lockup was removed.
Since this is about idle curiosity,
Anyone ever repurpose the zoom/helicoid from a mamiya rb or rz 100-200mm, I've never touched one but I'm tempted
All are toys when you consider the 800mm f4.0 (four!) from Pentax,
which would give an angle of view and depth of field more or less similar than a 400mm f1.7 lens on full frame 35mm.
View attachment 411653
The photo shows that even large lenses can be portable.
Hmm. More idle curiosity.
No one has mentioned the 12"/4.0 TTH Telephoto that flew on AGI F.134 and F.139 and Vinten F.95 cameras. These beasts shot 6x6 on long rolls of 70 (?) mm film. According to the VM it just covers 4x5 (not medium format, and not what it was made for). I have one that works very well on a 2x3 Speed Graphic.
Has anyone else here used one?
I had not thought of a barrel lens that would work on 2X3 Speed. The L.A times had a modified 4X5 Speed with a box that acted like a double bellows for a very long lens, like a 70 inches, might have been longer that was used for sports, shooting football from the press box. Depth of field must very shallow. For a 2X3 maybe a 24 inch barrel lens?
I have no idea what you are talking about.
Translations:
TTH = Taylor, Taylor & Hobson, still in operation as Cooke.
The cameras are all aerial cameras. British, used by air forces all over the world.
The lens in question is sharp, contrasty and has quite a short back focus (distance from rear of barrel to film plane when focused at infinity). I think it is the longest lens that fits comfortably on a 2x3 Speed. Should be adaptable to other cameras with focal plane shutters.
I think the Xenar's are 4 element Tessar configuration. A Tessar is adequate, but not an outstanding performer. Tessar lenses have three weaknesses. One is that they exhibit a great deal of spherical aberration, and the image plane is not as flat as it is with Gauss lenses. The last is the angle of view ( image circle) is limited and the max apertures are typically limited to F4.5-5.6.
It was a quote directly from a Nikon lens designer, so I have no reason to disbelieve him. I suspect it means relative to other types of lens formulas.Also, I don't think it is accurate to say tessar types have a great deal of spherical aberration, unless mis-designed.
I think the Xenar's are 4 element Tessar configuration. A Tessar is adequate, but not an outstanding performer. Tessar lenses have three weaknesses. One is that they exhibit a great deal of spherical aberration, and the image plane is not as flat as it is with Gauss lenses. The last is the angle of view ( image circle) is limited and the max apertures are typically limited to F4.5-5.6.
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