Jupiter 8 / Industar 61 l/d - Sharpness and Bokeh tests...

SergioGuerra

SergioGuerra

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Greetings!

Decided to test my recently aquired Industar 61 L/D 2.8/55 agaisnt my Jupiter 8 2/50.
I had bought the I-61 because I like very sharp and contrasty photos 🙂

The first test I made was using full aperture (2.8 on both) and got a bit upset... The jupiter 8 i think won this match, with good sharpness and better contrast. Please help me judging this one, but I think I am correct 🙂

The second test was outside with f/16... I think on this one the I-61 wons the match on sharpness and contrast.

The last test was with f/2.8 close focus to test both bokehs... I think I like both of them 🙂

This was also a test film that i had got (old hp5) and there are some marks from the tape that was holding the film (bulk roll) so sorry about that. The negativs also have some water marks... sorry about all of that 🙂

Please feel free to help me judging these both lens, and if you think they are in good shape. I bought both on ebay, and never had one before on my hands 🙂


Sergio
 
It's hard to tell the difference with your test shots, sorry. Reports say the I61 is sharper and the J8 is a sonnar with that character. Try maybe portraits for comparison, sharpness and OOF performance. And, you can see the full frame shots. Can you show details that show a difference? Maybe a portrait study can show the difference in details.

I will also try to compare a Sonnar (Steinheil, waiting for the mail), Double Gauss (Canon 1,2 and Summicron) and oldfashioned Tessars (FED and Elmar). Should show, I guess...

Rob.
 
I think some of the differences I see could be put down to slight exposure differences. E.g. in the second set the I-61 shot appears to have had more exposure than the J-8. Therefore more detail is apparent on the light/white wall.
 
Don't see any real difference - but it is hard to compare optics with little scans from 35mm negs. You'd need a pretty high resolution/high dynamic range scan to be able to compare optics.

The Industar looks like it has a little vignetting - but that is because it is wide open.
 
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Thanks for sharing these. Both lenses appear very good. You have to realize that the tests at f/2.8 have the I61 at a disadvantage as it is wide open, while the J8 is already stopped down by one stop. In general, lenses perform best stopped down 2 stops from its widest aperture.
 
There is a strange light over the Canon camera in the J8 picture that is totally absent in the Industar 61 picture. Other than that it is a tossup, but I prefer the J8 somehow, I also own oneof each.
Kurt M.
 
From the tests as they are though I think the very contrasty nature of the I61 becomes clear (middle shot), at first sight I can see quite some more information on the shadows of the J8.
 
Sergio: I am going to echo what Raid said. Comparisons of two (or thirty) lenses at f16 won't tell you anything (particularly not when the subject is essentially flat, like a bookcase), because by f16, diffraction from the small aperture (as well as exagerated depth of focus) is going to mask real differences between two lenses. Here is what I suggest you do: Take a look at Sean Reid's reviews of various lenses on the RD-1. He put his daughter (??) in a restaruant setting with lots of different shaped objects at various depths, put his camera on a tripod and made a series of exposires at wide apertures so that the rendering of different objects could be compared. That kind of test will, I think, illustrate something about the essential nature of each lens. Also, having a human form in the picture will help viewers see how a lens performs in the real world. I will never hang a picture of a bookcase on the wall to admire (I can just look at the bookcase). Now my daughter is another story!

Good luck and I am looking forward to seeing more tests of these lenses.

Ben Marks
 
I'm pretty sure the "strange light" in the J-8 interior is from another window that doesn't appear in the Industrar photo because it's behind the pillar or wall. The two pix are taken from a slilghtly different angle.
 
Thanks for all the comments, and I do agree I made some errors on these tests 🙂

It wasnt nothing well planed, I had just received this film, (very old) and wanted to test it to see if I could trust it for taking shoots outside... and had the idea to test the new I-61 agaisnt the J-8 🙂

I do have to learn a bit more on doing lens tests, and certainly doing sharpness tests using 400 asa film aint the best idea, but I posted them anyway because I hadnt found any test of this kind on the forum 🙂
I used same speed and same aperture, but it looks like aperture values are not equal on these lenses.. :|

Anyway, thanks for looking and please go take a look at some photos I took outside with the I-61. Seem pretty good to me 🙂

Round

and

Bolhao
 
Sergio,
Your willingness to do such tests is applauded. I know how much time and effort such a test can take. I am planning my next tests with 50mm lenses, and I learned from some the postings here about such tests.
 
Ben: Where are the test results posted?

"Take a look at Sean Reid's reviews of various lenses on the RD-1."
 
Sergio: Don't be discouraged! I do the same thing whenever I get a new lens. I just load up any old film and start shooting away. I applaud your putting the information out there!

Ben
 
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Benjamin Marks said:
Raid: Sean's fast lens results can be found at:

http://www.luminous-landscape.com/reviews/lenses/fastlensreview.shtml

A word of warning: there is a lot of pictorial data there so the page can take a while to load. And I see that he did do some flat-field testing, so apologies Sergio if I made it sound like there is only one way to do these sorts of tests.
Click to expand...

Thanks Benjamin. His tests are really extensive.
 
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