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Petri 3.5 135mm K mount
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PostPosted: Sat Jun 04, 2011 7:05 pm    Post subject: Petri 3.5 135mm K mount Reply with quote
Hi folks

No idea who made this lens, it's a K-mount so might be a Chinon.

It's by far the smallest 135 I've seen, not much larger than a Helios-44 58mm.

These shots are pretty boring and similar to a lot of other test shots I've taken recently, but i think they convey a good sense of this lens' abilities. It seems faster than 3.5 and colours are very vivid to my eyes, I think it's sharp and got good contrast, I like this lens, it's not as good as my two 1960s Petri lenses but it's not bad at all to my eyes...



100% crop:



Wide open:



100% crop:



My usual wide open sharpness subject:



100% crop:






Infinity test, even though it's mounted on my EOS using a Big-!s PK-EOS adapter it obviously does hit infinity. I can heartily recommend Big Is adapter, I have a dozen now and they are all great quality, solid chromed brass, I have Nikon, PK, OM, C/Y, M42, PB, M39 adapters to fit my EOS, all work great.



Bokeh test, wide open, bokeh seems smooth and not distracting:



Close-up test, focus is a bit off:



Contrast test, not long before sunset so sun low in sky to right of frame:



100% crop:



PostPosted: Sat Jun 04, 2011 7:44 pm    Post subject: Reply with quote
If it is this one it is Cosina:
Click here to see on Ebay
Nice lens. I have two samples. Focusing lubrication problem as with all lenses of this COSINA line. It works for you well it can be seen.


PostPosted: Sun Jun 05, 2011 12:33 am    Post subject: Reply with quote
i like how you found this in a k mount. i would love to know if they made many of these. other petri's in k mount? production numbers?


PostPosted: Sun Jun 05, 2011 1:01 am    Post subject: Reply with quote
Pancolart wrote:
If it is this one it is Cosina:
Click here to see on Ebay
Nice lens. I have two samples. Focusing lubrication problem as with all lenses of this COSINA line. It works for you well it can be seen.


That's the one, heard bad things about Cosina but this one seems pretty good.

I deliberately bought a K mount lens so I can use it with my Pentax MG, I also have a Pentax-M 2/50, a Vivitar/Komine 2.8/28 and a couple of zooms. I can use them all on my EOS DSLR as well as I have an adapter. I'll probably pick up some more K mount lenses when I see good ones cheap.


PostPosted: Sun Jun 05, 2011 7:40 am    Post subject: Reply with quote
Doesn't the aperture open lever hit the mirror?

Cosina primes are fine, there are few questionable cheap zooms. Talking about cheapo period. Lenses were good in early days and are even better after merging with Voigtländer.

Last edited by Pancolart on Sun Jun 05, 2011 7:45 am; edited 1 time in total


PostPosted: Sun Jun 05, 2011 7:44 am    Post subject: Reply with quote
No, it misses the mirror. The plastic projection at the rear did hit the mirror however so I cut it off.


PostPosted: Sun Jun 05, 2011 7:47 am    Post subject: Reply with quote
I have problem with many PK lenses on 5DmkII. I don't wan't to open or alter nice pieces like COSINA 2/28mm or Pentax-M SMC 2/35mm. In fact i miss K10D (Samsung variant) so much i will probably buy used one for the third time. Made 175.000 shots with first camera Smile! Since i know the buyer i also know it's still working going well over 200.000.


PostPosted: Sun Jun 05, 2011 8:37 am    Post subject: Reply with quote
I agree, modifying nice lenses is not something I like either, but this Petri was a cheap one and I took the risk.

Not tried it on my Pentax to see if it still works fine on a K mount camera...
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