Jupiter-8 on the CL

raytoei@gmail.com

raytoei@gmail.com

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Hi,

Brian Sweeney also fixed a back focus problem on the J-8, as well providing a new glass on one of the elements.

Here are the initial results, I am curious to find out if you guys are getting similar results as well, considering the wider variances on Russian lens, though the J-8 is supposed to be one of the better lenses around.

at F2, I find the J-8 is soft, ideal for portraiture shots. (Compare the difference (same model) with the J-8 and the previous thread where the I-50Rigid is tack sharp at f3.5)

j8-f2.jpg


at F16, I find the J-8 is sharp.
j8-f16.jpg


raytoei
 
On this lens, I put on a new optics module. Tested it out on the M8. Post a crop of your models eyes. I'd like to see what is going on.

I just rebuilt the collapsible I-50. Will be posting instructions soon. I find it good, but my early J-3's seem sharper.
 
I shot a J8 on a CL last month and found a back focus of about 4-6 inches when focusing at close to minimum distance. When the subject was further away, the back focus seemed to increase in distance. I'm going to shoot my a roll on my Zorki this month and then decide whether to shim it and/or send it to Brian.
 
Brian Sweeney said:
On this lens, I put on a new optics module. Tested it out on the M8. Post a crop of your models eyes. I'd like to see what is going on.

I just rebuilt the collapsible I-50. Will be posting instructions soon. I find it good, but my early J-3's seem sharper.
Click to expand...

Brian-
I'm quite interested in the collapsible I-50 results. I've got one also but haven't used it yet on my CL's (I have 2), still waiting to finish a roll with a newly acquired 40 'cron.

Surprisingly, my collapsible I-50 doesn't hit the meter stalk when I collapse it.
 
raytoei@gmail.com said:
Hi,

These are the files. be aware that they are around 11mb each.

http://retro.ms11.net/img376.tif
http://retro.ms11.net/img378.tif
http://retro.ms11.net/img373.tif
http://retro.ms11.net/img382.tif
http://retro.ms11.net/img391.tif


thanks!

raytoei
Click to expand...

The links come up with a "not found" error.

I would like to see some shots for what is going on.

I finished the I-50, put results up in the Mad Scientist forum.

http://www.rangefinderforum.com/forums/showthread.php?t=89934
 
The shots look good to me. With the J-8, J-3, and Sonnars in general: there is a lot of field curvature. If the focus is optimized for the center, you need to get a feel for pictures that you focus and recompose. "all part of the charm" of a Sonnar.
 
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