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04-05-2011, 09:19 PM   #1
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135/2.5K on K5?

Who's had experience with this lens on the K5? Does the aperture work manually from the lens? Any metering issues? Is the CA really that bad?

04-05-2011, 09:24 PM   #2
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QuoteOriginally posted by Mr_Canuck Quote
Does the aperture work manually from the lens?
As with any M lenses, you would choose the aperture on the lens and then stop down to meter. https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html

Here are a few reviews: SMC Pentax 135mm F2.5 Reviews - Pentax Lens Reviews & Pentax Lens Database

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04-06-2011, 01:14 AM   #3
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Mine works fine on my cameras. K10-K20.
Very nice lens....:-)
04-06-2011, 01:18 AM   #4
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The K135f2.5 is an awesome lens. Works perfectly with K20.

04-06-2011, 03:30 AM   #5
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Since CA is a property of the lens, not the sensor, it won't be any different than if seen on any camera, the K135F2.5 is an excellent lens, but I am sure if you look, you will find CA especially lateral CA in the out of focus areas, all other lenses of that era exhibited it.
04-06-2011, 10:52 AM   #6
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Thanks for the perspectives. Sounds like some of the vintage Minolta's I've used. Great build, sharp optics and sometimes legacy issues of flare or ca with digital sensors. It's an interesting lens for sure.
04-06-2011, 03:24 PM   #7
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QuoteOriginally posted by Mr_Canuck Quote
Thanks for the perspectives. Sounds like some of the vintage Minolta's I've used. Great build, sharp optics and sometimes legacy issues of flare or ca with digital sensors. It's an interesting lens for sure.
Not to sound like a PITA on this point but CA and flare with a lens have absolutely nothing to do with digital sensors they are a property of the lens design and exhibit the same behavior on film as they do on digital

Reflection off the rear element or parts at the rear of the lens and the sensor are sometimes present but somewhat rare. The same is true of purple fringing which should not be confused with CA

I find it somewhat discomforting when comments like this propagate unnecessarily
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