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Jupiter-12 35mm f/2.8 (L39)
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PostPosted: Mon Oct 20, 2014 9:31 am    Post subject: Reply with quote
What about the A7? I have a J12 I'd like to try, but have been reluctant to do so because I'm worried about shutter clearance with the big rear element. I understand that people here have used it successfully, but did you take any precautions or measurements to make sure it's OK? Is it safe for all focus positions including infinity? I think my current adapter is a bit on the thick side, so there's a bit of additional margin, but at some point I'd like to get the correct thickness to get proper infinity on various L39 lenses.


PostPosted: Mon Oct 20, 2014 11:49 am    Post subject: Reply with quote
I have the Contax RF/Kiev 4 version of this lens. It works fine at Sony A7 (infinity is reached). But it doesn' fit to other Sony NEX Cams.


PostPosted: Mon Oct 20, 2014 1:36 pm    Post subject: Reply with quote
dan_ wrote:
Or to cut the rear lens in a rectangular shape with the dimensions of the APS-C sensor, keep the lens focused closer when you mount it on the camera and after it is mounted you could focus to infinity. Just need to remember to only mount and unmount it when it's focused to the closest distance.


cutting in rectangular shape can be done, but mind the rotation of the lens when will be mounted


PostPosted: Mon Oct 20, 2014 1:39 pm    Post subject: Reply with quote
MartinV wrote:
What about the A7? I have a J12 I'd like to try, but have been reluctant to do so because I'm worried about shutter clearance with the big rear element. I understand that people here have used it successfully, but did you take any precautions or measurements to make sure it's OK? Is it safe for all focus positions including infinity? I think my current adapter is a bit on the thick side, so there's a bit of additional margin, but at some point I'd like to get the correct thickness to get proper infinity on various L39 lenses.


I didn't get any measurements but I've taken shots at max and min focus distance without any problem on the A7
http://www.telltale.it/black-and-white-october/


PostPosted: Mon Oct 20, 2014 1:57 pm    Post subject: Reply with quote
I have too on the A7R and I measured the clearance to be 1.8mm Wink

There is some color shift on A7R so I use the Flatfield plugin to correct, but A7 should have less problems.

http://manuellfokus.no/jupiter-12-35mm-f2-8/


PostPosted: Mon Oct 20, 2014 6:21 pm    Post subject: Reply with quote
Rick1779 wrote:

cutting in rectangular shape can be done, but mind the rotation of the lens when will be mounted


Ian said that the lens can be mounted on NEX but it can't reach infinity.
It will need to be mounted/unmounted only when the focusing helicoid is extended to maximum (minimum focusing distance). Then it can be focused to infinity if it's cut rectangular.

But that's only possible if wile focusing the lens doesn't rotate and I don't know if this is the case.


PostPosted: Mon Oct 20, 2014 11:01 pm    Post subject: Reply with quote
The best way is definitely to remove some plastic from the NEX rather than hack the back of the lens I think.

The amount of plastic needed to be removed is the distance the helicoid travels between infinity and mfd. It's not far, I reckon no more than 2mm.

I have seen pics on the net of NEX so modified.


PostPosted: Wed Oct 22, 2014 7:57 am    Post subject: Reply with quote
Nordentro wrote:
I have too on the A7R and I measured the clearance to be 1.8mm Wink

There is some color shift on A7R so I use the Flatfield plugin to correct, but A7 should have less problems.

http://manuellfokus.no/jupiter-12-35mm-f2-8/


yes, on A7 isn't bad at all, just some really soft corners at wider aperture


PostPosted: Wed Oct 22, 2014 5:24 pm    Post subject: Reply with quote
Tried two copies on the A7, silver 1963 and black 1987, both seemed to work shutter clearance wise, although the silver one is definitely a bit short of infinity on my adapter. Wide-open corners do look bad (blurred/smeared, didn't notice color shift), but the image center and corners stopped down seem OK. Will try to get some pictures out of them now. Thanks.


PostPosted: Wed Oct 22, 2014 9:56 pm    Post subject: Reply with quote
The J12 should be considered an f4lens really, as at f4 it performs nicely but at 2.8 it's poor. I find the character at f4 to be very nice indeed on bw film.


PostPosted: Wed Feb 04, 2015 3:04 am    Post subject: jupiter 12 lens wuth my Lumix G3 camera Reply with quote
jupiter 12 lens wuth my Lumix G3 camera without adaptor hand held shots...


PostPosted: Wed Feb 04, 2015 3:13 am    Post subject: Reply with quote
jupiter 12 lens wuth my Lumix G3 camera...http://forum.mflenses.com/userpix/20152/8819_P1730039_1.jpg


PostPosted: Thu Jun 15, 2017 8:02 am    Post subject: Reply with quote
Examples taken with Ricoh GXR-M at F2.8 (short distance ring was used):

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