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7Artisans 50mm f/1.1 in Leica M Mount
  
 
DavidBM
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p.12 #1 · p.12 #1 · 7Artisans 50mm f/1.1 in Leica M Mount


DaveFP wrote:
Who makes them Fred?



Lots of people make achromatic close up filters (Marumi, Kenko, Raynox, and various camera makers) but the problem is that we are not using them as intended: and we need far weaker achromats than most of the ones available (which are intended to make telezooms into semi macro lenses).

The only really weak achromat I know of is the Leica ELPRO 4 which is a .75 diopter one. There are a few others around 1 diopter to 1.5 which might be of some use, but only at the very closest distances.

It'd be great if we could find a modern multicoated maker of <1 diopter achromats...



Jan 18, 2018 at 11:04 PM
DavidBM
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p.12 #2 · p.12 #2 · 7Artisans 50mm f/1.1 in Leica M Mount


Fred Miranda wrote:
It's worth a try David. Perhaps one of the Elpros with a 46-55mm set-up ring?


Yep I ordered the 56-55 yesterday!! (will take forever to come though, as these things are 99 cents with free postage from China)



Jan 18, 2018 at 11:05 PM
DaveFP
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p.12 #3 · p.12 #3 · 7Artisans 50mm f/1.1 in Leica M Mount


Fred Miranda wrote:
The best ones for the CV 40/1.2 are the Leica Elpro 3 and Elpro 4. The latter allows you to focus from MDF until about 1.5m which is ideal. The close-up lens will move the lens focusing closer to infinity where it's optimal, so 1.5m = infinity with the Elpro 4. The Minolta is also a great option but I much prefer the IQ of the Leicas...and I'm not stuck-up...the different in IQ is real.


Thanks - Are the Canon 250D and 500D comparable?




Jan 18, 2018 at 11:10 PM
DavidBM
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p.12 #4 · p.12 #4 · 7Artisans 50mm f/1.1 in Leica M Mount


DaveFP wrote:
Thanks - Are the Canon 250D and 500D comparable?



They are both achromats.

But I think the 500D is a 2 diopter, which might be OK for some close work, but won't allow you to focus far enough away for many portraits. The 250D is I think about 4 diopter, which might allow semi macro work (But I wouldn't do that with a C-Sonnar) and definitely is too strong for our current uses.

Basically both are too strong for these purposes.



Jan 18, 2018 at 11:34 PM
DaveFP
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p.12 #5 · p.12 #5 · 7Artisans 50mm f/1.1 in Leica M Mount


DavidBM wrote:
They are both achromats.

But I think the 500D is a 2 diopter, which might be OK for some close work, but won't allow you to focus far enough away for many portraits. The 250D is I think about 4 diopter, which might allow semi macro work (But I wouldn't do that with a C-Sonnar) and definitely is too strong for our current uses.

Basically both are too strong for these purposes.


Ah; got it. Thank you.



Jan 18, 2018 at 11:38 PM
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