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03-27-2011, 01:40 PM   #1
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New Lens Problems?

Hi, I just ordered an 18-55 WR to use with my new (yes, new old stock) K200D and was wondering how I should check it over when it gets here for problems, such as decentering, FF/BF etc. Unless it's really obvious I don't think I'd be able to spot if glass if out of alignement, for example. Can anyone give me a few tips, please? Also, how has this particular lens fared as far as QC goes? Thanks!

03-27-2011, 02:16 PM   #2
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Go out and take pictures with it.
03-27-2011, 04:41 PM   #3
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Unlike the 16-50/2.8, the kit zooms don't seem to suffer as much decentering. But one fast way to check is using live-view. I don't know about Pentax bodies, but my 40D allows me to manual focus at 10X on the LCD. I just check the focus of left & right at different focal lengths and see if they agree with each other. If not, it's optically misaligned.
03-28-2011, 04:42 AM   #4
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QuoteOriginally posted by Wheatfield Quote
Go out and take pictures with it.
Ditto!!!

I bought one for my wife's K200D a while ago. A fine lens - camera kit combo.

03-29-2011, 04:40 AM   #5
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Thanks everyone!
03-29-2011, 05:14 PM   #6
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Sure, take photos with it but be systematic. Shoot at different focal lengths. Examine your shots to see how well it focuses. Shoot at a test chart to see how well it autofocuses.
04-01-2011, 09:25 PM   #7
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It seems sometimes that less ambitious lens designs suffer less from quality control issues, but you should test it thoroughly by taking controlled pictures that include conditions under which you usually photograph. For example, if you favor landscapes, don't test your lens only by shooting a test target at 5ft. I tend to take pictures of distant traffic signs, and move the camera such that the sign appears in different parts of the image - center, each corner, etc. Recently I purchased a Pentax 55-300 in hopes of replacing both my Pentax 50-200 and 100-300F. The 55-300 was very disappointing and that showed up clearly and consistently in significant differences in performance across the frame, so I returned it.

Paul
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