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Forum: Pentax K-5 & K-5 II
02-16-2011, 05:27 PM
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Okay, now that I have better idea of what I am doing, I have completely redone the AF fine adjustment for my lenses.
Most of my lenses require none or very small adjustments (typically 0, +1, +2)
The lens requiring the most adjustment was the DA 21mm Ltd - which required a +6.
I discovered using the Spyder Lenscal that the camera does need to be quite close - enough for the focus area to fill up at least a third of the viewing frame, otherwise there is a chance for the camera not to focus accurately on the target. So focusing 10m away on a wideangle is just not doable for me.
I have not adjusted the Sigma at all, but fortunately the factory setting is close enough for it not to require adjustment.
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Forum: Pentax K-5 & K-5 II
02-12-2011, 01:32 AM
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Thanks - no I wasn't on very close distances - probably 2-3m depending on lens
I had to go closer for the wide angles, which were the ones closer to 50-50, exactly as you predicted.
So basically the factory adjustment is fine.
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Forum: Pentax K-5 & K-5 II
02-11-2011, 08:08 PM
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Thanks for the useful info.
I believe nearly all my lens come out with 1/3-2/3 focus when I used the Spyder Lenscal, and I have been trying to adjust them to 50-50 focus.
Guess I was an idiot! Anyway, have reset AF fine adjustment to factory defaults.
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Forum: Pentax K-5 & K-5 II
02-11-2011, 11:38 AM
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Thanks - I think I might reset my AF adjustment back to factory. To paraphrase the manual, don't adjust unless you know what you are doing. And it appears I don't.
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Forum: Pentax K-5 & K-5 II
02-10-2011, 11:18 AM
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Just to clarify.
There is actually no BF on the factory AF adjustment. All shots taken on all lenses are correctly focused.
It's just that the "focus zone" appears to be slightly shifted towards the back - ie. it extends less in front of the target focus point and more to the back of the focus point.
Does that make sense?
I have been trying to adjust the lens so that the focus zone extends equally to the front and the back.
Am I doing the right thing? Should I just have left the camera at factory setting?
I am tempted, given the camera will not adjust AF for my Sigma lens, to reset everything back to factory.
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Forum: Pentax K-5 & K-5 II
02-09-2011, 03:01 PM
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Thanks for the fast response, guys.
Yes, you are absolutely right - the Sigma 18-50 EX does not have a lens ID - Lightroom shows it as "Unknown Sigma lens" so guess that's the problem.
I'll try adjusting my Tamron and see if it works on the Tamron.
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Forum: Pentax K-5 & K-5 II
02-09-2011, 02:36 PM
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Hi
I have been trying to calibrate my lens collection to my new K-5 with the Spyder Lenscal.
The process worked on all my Pentax lenses (DA21, FA24, FA43, DA70, FA-J 18-105, DA 18-35) but inexplicably does not seem to yield any difference on my Sigma 18-50 EX.
I still haven't finished calibrating my Pentax 100-300 and Tamron 28-300 yet. It started raining on me and I had to stop calibrating.
Has anyone successfully calibrated the K-5 to a non Pentax lens? I know there are issues with using SR on non Pentax lenses but I didn't think AF adjustment would be a problem (manual doesn't mention any limitation).
PS - my K-5 seems to have a tendency towards back focusing. Maybe this is the reason I don't have FF in low light? :lol:
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