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07-18-2016, 10:57 PM   #1
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K135 2.5 how useful?

I happened to look up the Craigslist and got this lens for 60$. I read the reviews online and found that it suffers from CA wide open. Any suggestions on how could I use it to minimise CA on my K-50? Also, I am thinking of upgrading the body to K-3. Does that help in any way?

07-18-2016, 11:07 PM   #2
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That's a bargain price for sure. Awesome!

QuoteOriginally posted by boraclicks Quote
Any suggestions on how could I use it to minimise CA on my K-50?
Stop down Photoshop/lightroom/other editors have pretty effective aberration control tools, but stopping down is your first line of defense.

QuoteOriginally posted by boraclicks Quote
Also, I am thinking of upgrading the body to K-3.
You'll get higher image resolution -> more detail.

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07-18-2016, 11:54 PM   #3
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It is reported as one of the best budget astrophotography telephoto lens here: The Best Telephoto Lenses for Astrophotography - Articles - Articles - Articles - Cloudy Nights
07-19-2016, 02:58 AM   #4
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Ok that is a great price. And yes it does suffer from CA.

This lens can be shot wide open with care. You will have to either frame your shot well to minimise the impact of CA and/or post process to remove. Relatively easy to remove the CA in PPing but you will have to be careful of CA in out of focus areas (best use good distance separation from subject and fore/background scenery).

But to be honest, this lens is best stopped down a stop or two. The f2.5 is extremely useful for manual focusing in low light - an invaluable benefit. After getting critical focus, stop the lens down and shoot. The images are stunning (with the bokeh effect still there).

07-19-2016, 08:05 AM   #5
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Its a VERY Capable lens.
To minimize Flair use a Hood ! I don't think upgrading a body is really going to have any effect on it either way.
07-19-2016, 08:07 AM   #6
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Took this sample shot yesterday evening at F3.2
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PENTAX K-50  Photo 
07-19-2016, 08:21 AM   #7
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I would have expected sharper than that. How do the elements look? Any haze evident?
07-19-2016, 08:49 AM   #8
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Don't forget that if you want to see what a certain lens is capable of producing, you can always visit the Pentax Photo Gallery and check out photos taken with that lens.

07-19-2016, 08:51 AM   #9
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Nope. There is no haze or fungus. There are few dust particles. I will check the Gallery.
07-19-2016, 10:00 AM   #10
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One just appeared on the marketplace
https://www.pentaxforums.com/forums/24-photographic-equipment-sale/326180-sal...condition.html
07-19-2016, 11:04 AM   #11
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Yes. Guess, it's a coincidence.
08-04-2016, 05:34 AM   #12
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So, I started using this lens. I figured out that it has to be used in complete Manual mode for sharpest pictures. Best pictures come at F4 and higher. Since this is my first stint with complete manual lens, should I keep anything else in mind?
08-04-2016, 05:39 AM   #13
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QuoteOriginally posted by boraclicks Quote
Since this is my first stint with complete manual lens, should I keep anything else in mind?
Yes.
Have fun. It's a great lens.
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