HaruhikoT Offline Upload & Sell: Off
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artur5 wrote:
What I’m foreseeing as a potential source of trouble is the infinity question. For instance, an additional front element of 5mtr. changes the focal of a Zeiss G 45/2 into a 44.7mm. lens. We’d need to reduce 0.3mm, the distance to the focal plane in order to reach infinity.
Most cheap adapters are 0.1 - 0.2mm. thinner than required, but it takes a very sloppy Sony-E to M adapter to be at least 0.3mm out of specifications. That rules out the Techart TAP or other good quality brands, except if the ring has the possibility of fine tuning infinity ( I believe the last version of the Hawks with helical has this feature ? )
Adjusting the infinity hard stop of the lens itself could be another solution but, depending on the construction, sometimes this is very difficult or not possible at all. Besides, it wouldn’t be useful for people trying to use that lens on different cameras.
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You are right this is possible issue for Leica M lenses + TAP or good quality adapters.
One possible (but wild ) solution is, to disassemble the adapter and grind its mount plate.
I don't have TAP but my techart contax G adapter have 1mm+ thick mount plate, so grinding it 0.3mm is maybe possible.
For Contax G lenses, sinse these are native AF lenses and as I look at mine, not only ContaxG-E adapters but also helicoids of these lenses themselves have enough margin. So I'm not worry about G lenses.
And just nitpicking but G45 + PCX 5m changes its FL only 0.2mm, because 2 lenses combined focal length is obtained from not only each lens' focal length but also distance between each lens's principal plane.
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