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06-07-2019, 10:02 PM   #16
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I'd keep the tak bayonet, the others aren't interesting or significant enough to give up for the performance. People talk about flare but honestly if you need a lens for such demanding situations get the Samyang and save yourself some headache. If you want Tak Bayonet performance for a bit more money get the Pentax-A 135 f2.8 since it matches the tak bayonet in sharpness while having the coatings.

06-09-2019, 08:02 AM   #17
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The screw mount takumar is optical the best of the three on 'full frame', the lower edge performace of the M goes unnoticed on apc-c, build quality of the screw mount is the best, the bayonet takumar the worst (mine keeps getting grease on the aperture blades, even after several cleanings).
06-09-2019, 10:00 AM   #18
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QuoteOriginally posted by tonyzoc Quote
I'm surprised no one mentioned the SMC Pentax 135mm f/2.5 lens.
I am suprised, too. You can find the 135/3.5 on every fleamarket for cameras and it is bad! The 135/2.5 is more seldom, but MUCH better. I use it often on my K1 and I think it is in the same class than the 85/1.8.

You should buy one if you find it in good condition.

06-09-2019, 02:11 PM   #19
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Individual lens variation would more than make up the IQ difference between these three. You need to do a test comparison on your three.
My M135 3.5 is easily the worst and my Tak Bayonet 135 2.5 is the best.
Obviously the 2.5 is a more versatile lens if you wish to utilise it wide open.
I don't notice any significant difference in the coatings.


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