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09-25-2009, 07:38 AM   #1
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Test results: resurrected Zykkor 135mm Manual Lens

Hello,

I had a few minutes to test outdoors the 135mm freebee lens I fixed.
Disclaimer: I'm NOT a expert testing lenses. I'm NOT a professional photographer. I'm just an enthusiast who likes to tinker with his toys.
So this is not meant to be any type of definitive test or results. I'm just having fun here....

Here is the link to the original thread.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/74433-freebee-lens-fixed.html

Here is the lens.


Test results: K100D Super / JPG / ISO200 / SR Off / Tripod mounted / Cable release / 2s timer / No PP

1/4000 @ f2.8

100% crop


1/1000 @ f8

100% crop


1/200 @ f16

100% crop


1/80 @ f22

100% crop


As expected: quite soft wide open. Decently sharp at f8 and above. Somehow f16 seems a hair better than f22.
Colors and contrast not bad.

While not an everyday lens, I was pleasantly surprised. with a FOV equivalent focal lenght of around 200mm it may have its use.
What do you think?

Thanks,

09-25-2009, 08:20 AM   #2
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it seems to be a good lens, not bad wide open..I certainly beats the SMC Takumar 135mm f/2.5 that I loathe. and it doesn't appear to have significant purple fringing or LOCA and the bokeh looks decent.
09-25-2009, 08:58 AM   #3
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Doesn't look bad at all to me. It's a little soft wide open, as expected, but not bad. I'd be interested to know where it sharpens up. By what I see, I wouldn't be surprised if f4 would be fairly sharp (or even f3.5). I think the lens is sharp enough to see some use.
09-25-2009, 12:57 PM   #4
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A very acceptable result.
There are many f/2.8 lenses out there, prime and zoom alike, that don't come out this well.
I too wonder when central sharpness comes through nicely and whether that changes with distant and near subjects.

09-27-2009, 07:36 PM   #5
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Original Poster
Thanks all for the comments.
That's a very good idea for another test: A matrix with different apertures at different focusing distances.
Just a question: What does LOCA stands for?

Thanks,
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