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Forum: Troubleshooting and Beginner Help
10-18-2012, 02:28 AM
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I tested with a simple setup: big ruler at 45 degree angle, camera on small tripod, single focus point (center), wide open, refocusing when changing focal length, selftimer, av setting.
But reading all your reactions (thank you!) I guess I should quit trying to get my camera and lenses to work perfectly. The pictures coming out of the camera (after some adjustments) are nice, especially when focal length is not at an extreme end. And maybe I should take pictures with smaller apertures: more forgiving and at 4.0 (instead of 2.8) still giving great DOF.
Thanks again for your replies!
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Forum: Troubleshooting and Beginner Help
10-16-2012, 10:18 AM
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I adjusted my K-x. Now both lenses have backfocus zoomed out and have frontfocus when zoomed in. Somewhere in the middle they focus perfectly. But shouldnt a zoom lens focus the same at every length?
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Forum: Troubleshooting and Beginner Help
10-15-2012, 05:48 AM
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Hi, I own a white K-x with a Sigma 17-70, a Sigma 50-150 and the 18-55 kit lens and I'm experiencing some back- and front focus. I did some testing and got the following results:
White K-x:
Sigma 17-70 backfocus becomes less when zooming in
Sigma 50-150 backfocus becomes less when zooming in, perfect at 150mm
Pentax 18-55 (kit) backfocus becomes frontfocus when zooming in
Pink K-x (my sisters):
Sigma 17-70 frontfocus at every length
Sigma 50-150 backfocus becomes frontfocus when zooming in
Pentax 18-55 (kit) frontfocus at every length
Sigma checked their lenses and indicated they are okay (within their margins). At this point I have no idea if it's me, the lenses or the camera(s), but I would really like to get the "problem" fixed. Do any of you have advice? Thanks!
Sorry for any misspellings or bad grammar, English is not my native language.
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