Re: Depth of Field Adapter on Steroids
Tons o Glass 0 Class wrote:
fferreres wrote:
Tons o Glass 0 Class wrote:
On a 4x5-based DOF adapter rig, f/2.5 via an Aero Ektar, f/2.8 via a Xenotar, or f/2.9 via a Pentac gets you f/0.67, f/0.74, or f/0.77 equivalent aperture emulations, respectively.
I will try adapting a Rollei Heidosmat 150mm F2.8 MC. It's as cheap as it goes and the next stop would be some 4.5 Tessars of which there are a million or some many cheap Fujinar f4.5 (usually better crafted). But f4.5 is more like f1.2 and thus less interesting. I think f2 is where 4x5 gets funny with f0.5 view.
Glad you mentioned the f/4.5 Tessars - I happen to be researching ones to get for 8x10 (I may base my rig around 12x12" Fresnels and include a way to shoot 8x10 film without them). To cover 8x10 I've found out I need about a 12" or longer FL f/4.5 Tessar-type. The point of entry seems to be about $250 for one in rough shape whether it's mounted in a shutter or in a barrel. The ones I know to look for so far are:
- Kodak (via an Anastigmat/Anastar/Anaston/Ektanar/Ektar/Ektanon - some of these are marketed as projection / enlarger lenses, and the Ektars are not as cheap),
- B&L (via a Series Ic)
- Schneider (via a Xenar),
- Ross (via an Xpres Anastigmat),
- CZJ (of course),
- Ilex (via an Anastigmat)
- Wollensak (via a Velostigmat or Raptar II - OK these don't look as cheap)
- Gundlach (via a Radar Anastigmat)
- Fujinon (via a Fujinar - some are enlarger lenses)
Kodak' s Ektar name covers more optical designs than the Tessar type. The Anastar became the name of what essentially was the Anastigmat Special up to 1950, both Tessar type but I think both never went beyond 127mm focal length. Anastons are Triplets.
It will be hard to find 300mm 4.5 or faster Tessar types for 8x10 anyway. I still have a Rodenstock Apo Ronar 240mm 9.0 reproduction lens here, brass so heavy. Wonder what it covers but I think 8x10 is possible. Sold a light alu barrel Apo-Nikkor 360mm 9.0 that covered more than 8x10. Used for repro work.
Met vriendelijke groet, Ernst
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