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02-04-2012, 03:32 AM   #1
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Should I get this lens serviced?

Check this photo, I'd rather not say which lens it is because the answer might affect your opinion. Just look at the photo and see if you think the sharpness is acceptable for a modern dslr lens of a moderate price.

Image at:
http://www.verglace.com/newspaperwideopen.jpg

Notice bottom right, try not to look at the exif (not sure if its been stripped or not), knowing which lens it is might affect your opinion.

02-04-2012, 06:55 AM   #2
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the main problem with the picture is that the shoe missed bush...

the pic does look way more soft on the bottom right and vignetted, if you have another lens i'd send this one in for servicing
02-04-2012, 07:34 AM   #3
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OK, I'm following the rules by not looking at the EXIF.

Certainly the edges are weaker.
That may just be field curvature if the aperture is wide.

The bottom right corner is not as sharp as the top left corner.
That might have happened if the sensor plane
wasn't exactly parallel to the newspaper.

So without knowing more,
I wouldn't necessarily assume it needs servicing.

Personally, I would only worry about a lens
if it's not giving the expected performance in everyday use.
Is that what led to this test?
02-04-2012, 09:52 AM   #4
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Given the non flat surface and no knowledge of the lighting I don't think the photo shows any quantifiable indication of an issue with the lens

Start with a flat subject uniformly lit and the camera really square to the subject, then we can talk about whether there is anything asymmetrical about performance

02-04-2012, 10:18 AM   #5
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The newspaper was taped to a wall as tightly as I can to make it straight, although now that I think about it, if I just taped a single page it would have been straighter. The sensor and the wall probably wasn't perfectly parallel. Ill try another photo tomorrow
02-04-2012, 10:20 AM   #6
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Is there a brick wall handy?
02-04-2012, 07:08 PM   #7
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QuoteOriginally posted by gp1806 Quote
Is there a brick wall handy?
More pics

http://www.verglace.com/brick.jpg
http://www.verglace.com/pebbles.jpg
02-04-2012, 09:21 PM   #8
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Is that your new DA*16-50? (No, I haven't looked at the exif). If so its how it performs at its extremities wide open.

02-04-2012, 09:30 PM   #9
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its not a 16-50, but are you serious? that can't be right :/
02-04-2012, 09:56 PM   #10
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Assuming the tests were done correctly, optical misalignment might or might not be corrected depends on which lens. But to be honest, I am not sure why I bother to answer since you are determined to tell us nothing.
02-04-2012, 10:10 PM   #11
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Fine fine, its the kit 18-55 lens, but just because its a kit lens doesn't mean it doesn't deserve any servicing love if it needs it.
02-04-2012, 10:23 PM   #12
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Get a new kit lens. Service costs the same as new one or even more. Also kit lens has weak spot at wide open and at zoom ends. It is very good at mid zoom and around f8.
Good luck.
02-04-2012, 10:29 PM   #13
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Depends on the focal length setting and the aperture. And which version of the kit lens? At the extremes the kit lens is reliably soft, has distortion, and falloff. Take a look at the dpreview for the original version of the lens (which is the one I have, and I see the same results as they do on mine): Pentax DA 18-55mm 1:3.5-5.6 AL Lens Review: 1. Introduction: Digital Photography Review

Does the newer version perform any better optically?
02-04-2012, 10:37 PM   #14
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Its the 18-55 WR that came with the K-5, so its $200-250ish new, which is why I said moderately priced, I don't know why but I love this lens so much. I'm gonna buy a DA*16-50 tomorrow but Im keeping this lens as a back up, so was thinking if I should get it serviced or not. I noticed the fuzzy haze in that lower right corner in some of my photos which lead to the test but if its too expensive to service I will just avoid that area and crop.

Edit: actually with what selar said that the 16-50 performs like those wide open, I'm beginning to have doubts now and thinking 18-135 instead :S.

Last edited by Verglace; 02-04-2012 at 10:46 PM.
02-04-2012, 10:48 PM   #15
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My limited experience with the lens is the original version (came with my K10D) -- I've hardly ever used it. I have heard anecdotal evidence that the mark II version was improved, but don't know if there have been any systematic tests comparing the two. But the original version definitely had its limitations...
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