Search results for 'back focus' - page 757
Help with AF with Pentax 55-300 mm
I'm not sure what's going on in this particular case, so I'll just make a couple of general points. 1. Focus points can be slightly differently positioned from how they are indcated in the viewfinder. 2. Sometimes you have to find the edge of an object or a different part of the subject to get...
Posted by iceblinker on 05/03/2009 - 13:06
Help with AF with Pentax 55-300 mm
I'm not sure if this is what you are describing amin. This was taken with a 70-200 tamron. i was pointing at the perching birds but the picture seams focused on the lettering on the building to the left. i think what i did wrong was to leave the auto focus set to auto select the focus point. It's...
Posted by bforbes on 06/03/2009 - 00:51
Help with AF with Pentax 55-300 mm
In the first shot Amin the branch in the upper right corner seems in focus but moved, could it be that you/the camera focused on that?
Posted by Anvh on 06/03/2009 - 00:55
Help with AF with Pentax 55-300 mm
Hi again, This is really really strange, and I really dont have any logical explanation for this. After reading page 106 of the manual and getting ready to adjust my AF, I got my stuff ready including my laptop to shoot tethered and make adjustments, put my camera on a tripod again and aimed a...
Posted by aminstar on 06/03/2009 - 07:02
Help with AF with Pentax 55-300 mm
Amin, The camera would behave the same way each time if everything really was exactly the same each time with the subject and camera. But the smallest change of aim or light can make the camera behave differently. You may think you're aiming at the same part of the flower, but in fact have moved ...
Posted by iceblinker on 06/03/2009 - 10:02
Help with AF with Pentax 55-300 mm
Amin, The camera would behave the same way each time if everything really was exactly the same each time with the subject and camera. But the smallest change of aim or light can make the camera behave differently. You may think you're aiming at the same part of the flower, but in fact have moved ...
Posted by aminstar on 06/03/2009 - 10:09
Second attempt: pentax 100 2.8 smc dfa sharpness
Here is my second attempt (after one) to solicit views on the sharpness of this lens. I took advise from my previous attempt and taken pictures of a map at various apertures. Any help much appreciated. I think it may not have been totally straight as the top left seems to be out of focus or th...
Posted by ericp on 05/03/2009 - 15:37
Second attempt: pentax 100 2.8 smc dfa sharpness
They look OK to me a bit flat but that may be the lighting, the top edge where it looks soft could be a bit out of focus. shim
Posted by shim on 05/03/2009 - 18:25
Back focusing on Pentax FA 50mm 1.4
I've just started noticing that my FA 50mm lens is focusing about 5mm-10mm beyond the intended focus point. Has anyone experienced this sort of problem with this or any other lens? Does anyone know of a way to correct the problem other than the rather hit-and-miss solution of focusing on something...
Posted by sunface13 on 06/03/2009 - 10:00
Back focusing on Pentax FA 50mm 1.4
You haven't said if this is during AF or MF. There is another thread going on currently about MF problems. Basically I don't think you can do much about it except take a second shot from 10mm back (MF only) or use a small f stop. shim
Posted by shim on 06/03/2009 - 10:07
Back focusing on Pentax FA 50mm 1.4
If you're quite sure about the back focusing, and suspect it may be happening with other lenses too*, you could take the camera to a service engineer to be adjusted, or do it yourself: http://forums.dpreview.com/forums/readflat.asp?forum=1036&message=22023704&changemode=1 * It may be not be so...
Posted by iceblinker on 06/03/2009 - 10:09
Back focusing on Pentax FA 50mm 1.4
Thanks for that link Pete.... I knew you could alter the K10 and K20, but didn't know the others can be done as well. I found with the K10 that the minimum adjustment brought me in front by 5-10mm which is actually worse because non of the object is then in focus and your out of range with DOF. It w...
Posted by shim on 06/03/2009 - 10:33
Back focusing on Pentax FA 50mm 1.4
Thanks very much for the quick replies. I did a quick test with the kit lens and that appeared to be back-focusing too. So I followed the instructions on the link from iceblinker and it appears to be focusing accurately now. Thanks again.
Posted by sunface13 on 06/03/2009 - 10:50
Back focusing on Pentax FA 50mm 1.4
That's good to hear. Glad it worked 8)
Posted by iceblinker on 06/03/2009 - 11:28
Issue with Adaptall PKA mount
I've just bought a PKA mount off Ebay which doesn't appear to work. Do yo have any suggestions that I should try before I send it back?? Regards Simon
Posted by rqy99g on 07/03/2009 - 11:02
Issue with Adaptall PKA mount
I do know they can be very temperamental things those PK/A mounts. I have one back in the UK that is next to useless, loses contact at the most annoying times. Probably why they stopped making them. If its not making contact while twisting and you have tried the other things then I would send i...
Posted by Mike-P on 07/03/2009 - 14:50
Issue with Adaptall PKA mount
Shim, thanks for that! I obviously wasn't using enough elbow grease (and was a bit worried about damaging if I did have to send it back). :D:D:D:D:D:D Thanks again (and to Mike). Simon
Posted by rqy99g on 07/03/2009 - 16:54
Sigma 18-250 HSM
There are still Pentax versions around, and it is a good lens, but it is bulky and doesn't focus that close. In terms of travelling weight and bulk, the 18-55mm plus 50-200mm is a more compact kit.
Posted by johnriley on 07/03/2009 - 15:34
Pentax-F 100mm 2.8 Macro?
I plan to buy a fast 100mm macro lens, maybe not yet (need some money), but started looking already - maybe I'll find a bargain? :) My favourite one is DA 100mm - I never thought about it before, but AF with QuickShift is sooooo gooood... I appreciated the feature once I tried Tamron 70-300mm whi...
Posted by misiek_knm on 09/03/2009 - 21:04
Pentax-F 100mm 2.8 Macro?
Only DA lenses have quickshift if that was your question, you can of course focus manually if you set the switch to that. Macro lenses also won't go cheap second hand so find a good price for the D-FA, I would say. It's a lens that you will keep for life if you like it :)
Posted by Anvh on 09/03/2009 - 22:48
