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02-17-2015, 08:53 PM   #16
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Ok had a reply from Tamron (well the repairer)...

Japan have advised me the A001P and A09P where developed long before live view was implemented and may not focus efficiently when used in live view and have advised to manually focus the lens when using this function. Optically adjusting these lenses can improve resolution which we can do but this will affect focus shift and only Japan has the tool for adjusting the focus shift on the Pentax version lenses, please note though this will not improve live view operation.

So I either manually focus (kind of impossible if I'm using liveview to get over crowds) or just ignore live view on these lenses.

As we only have the choice of the tamron (unless you can find an old decent sigma) 70-200 at a reasonable price, or the new pentax at a very high price, I guess i'm screwed either way!

Just playing with the pentax 16-45 and liveview focus speed is incredibly different (fast) compared to the tamrons... i'll see what i find..

Steve

02-17-2015, 10:00 PM   #17
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I'm have a problem with my Tamron 17-50 2.8. Posted a image yesterday of Buttermilk Road ,shot at f11.
02-17-2015, 11:04 PM - 1 Like   #18
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That picture looks fairly sharp to me.. search on here about the softness discussions, more MP demands more from the user, there are quite a few discussions on here about how to help this..

Steve
02-25-2015, 08:58 AM   #19
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If you tell me step by step what to do I would like to learn. I bought a used Tamron 70-200 f/2.8 for my K-3 a few months ago. I have not used it much. Seems okay. But I don't know for sure!

02-27-2015, 02:19 AM   #20
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Hi David

Simply switch live view on, set aperture to f2.8 and take a picture of a focus chart at a low angle (as shown in my pictures) - or even simpler something like 5 AA batteries aligned diagonally across the plane of the lens, focus on the middle one (from a distance at 200mm) and take a shot.. see if any are in focus. on mine, depending on the spacing the front or rear would be in focus, but at larger focal distances that mis-focus appears to get into the meters range!

The only time I would use liveview is when i'm getting shots over peoples heads, if using liveview on a tripod I would likely manual focus anyway. I now just have to tweak the focus adjustment for a couple of the lenses to bring the PDAF focus into a better accuracy (this doesnt effect liveview tho)

Thanks

Steve
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