Search results for 'back focus' - page 1492
Kx infinity focus problem
Cheers guys for all your suggestions and help. I'll try and upload some pictures asap. I have a free flickr account but have to prepare some crops at the right size so that flickr doesn't scale them. In the meantime I'll take some more shots, with this problem being quite erratic obviously. Just ...
Posted by Wolfson on 01/01/2010 - 19:14
Kx infinity focus problem
It depends on the contrast and size of the subject and the lighting. If it has quite some contrast and it's during day light then I expect it to be accurate enough to rely on, so over the 90%. Although I know the limitations so I don't rely that it would get the focus that I want most of the time.
Posted by Anvh on 01/01/2010 - 19:49
Kx infinity focus problem
OK, here's a first try. For wide angle tests I am frequently shooting the view from my window, which is quite challenging: http://farm3.static.flickr.com/2528/4234683190_af7275ff48_o.jpg Here's a center crop from the very best result a got in auto focus from the Tamron 18-250 at 18mm and f3.5:...
Posted by Wolfson on 01/01/2010 - 19:50
Kx infinity focus problem
Indeed that looks like a focus problem. Contact the shop and see what they can do for you, probably a recalibration by pentax might solve it I presume the camera is new so you might ask that they swap it for a new one.
Posted by Anvh on 01/01/2010 - 19:56
Kx infinity focus problem
Cheers Stefan. So you'd think it could be the camera? Just to give you another idea, on the long end of the Tamron, the test scene I described in my OP. This is the test scene: http://farm5.static.flickr.com/4035/4233985893_36b6b10e06_o.jpg Here are four test shots with F6.3 and F8, all 1/500...
Posted by Wolfson on 01/01/2010 - 20:16
Kx infinity focus problem
Just to get it right, both your long lenses have this problem right? I think it's an AF problem but it could be a bit of both so the lens and the camera. It could be that the camera work well with another lens but since you've two lenses I think that the camera is more likely the source. One t...
Posted by Anvh on 01/01/2010 - 21:29
Kx infinity focus problem
A couple of thoughts - Are you using any filters? I have a cheap and nasty CPL which prevents focus at infinity. The file sizes look a little small. Have you got the Jpeg quality set low somewhere?
Posted by Oggy on 01/01/2010 - 22:07
Kx infinity focus problem
Stefan, Oggy, I am not using any filters for these shots. The file sizes are smallish for the two downscaled shots that show the full scene. All the crops are unscaled crops of 1024 pixel maximum size in the larger dimension, the biggest that flickr allows. I shot raw, imported via Adobe Camera R...
Posted by Wolfson on 01/01/2010 - 23:06
Kx infinity focus problem
I also have a second Tammy 18-250mm with which I took another 4 shots of the radio tower earlier. This one had a better hit rate, with 1 sharp image, 2 reasonably well focused ones and one out of focus, all shot under the same conditions as before. Better, but not really good IMO... Than it looks li...
Posted by Anvh on 01/01/2010 - 23:21
Kx infinity focus problem
Sorry, I was miss led about lens correction by the chart in the . Shame really, that should be standard on all new bodies no matter where in the range they are.:wink:
Posted by Hardgravity on 01/01/2010 - 23:21
Kx infinity focus problem
Hi Guys This all sounds too familiar to me. I have a K10 which has a poor spot on focus rate. One blames oneself, the lenses but I let my camera get out of warranty before feeling that it might be a friday afternoon model. I'm told that other makes of DSLRs show similar autofocus issues as p...
Posted by Rataegeoff on 02/01/2010 - 00:09
Kx infinity focus problem
AF is not and never has been perfect. It will be fooled by low light, low contrast and it only knows where you want it to focus if you tell it. I find the best way is to use centre-point focus only. lock with a half press on the shutter release, recompose and fire. If it's worked you can see it s...
Posted by johnriley on 02/01/2010 - 11:14
Kx infinity focus problem
The camera has been wrongly calibrated if AF consistently front or back focuses with all lenses when using a single point with subjects with good light and contrast.
Posted by iceblinker on 02/01/2010 - 12:15
Kx infinity focus problem
Thanks guys for all your help and support. BTW, my sample pictures were all taken with signle focus point (centre) and did have a good contrast. The K100D did not show such issues. Anyway, I went to the shop today, showed them my samples. They took a few images themselves and the jury was still o...
Posted by Wolfson on 02/01/2010 - 16:17
Kx infinity focus problem
Glad to hear you got a good result. Happy New Year!
Posted by johnriley on 02/01/2010 - 16:29
Kx infinity focus problem
My experience with the K10 did improve with the advice that John gave me a while ago. That was to use the AF button for the focus (yes centre point only) and then fire the shutter when the picture presents itself. (this is for football or group subjects). This combination of AF button and shutter ...
Posted by Rataegeoff on 02/01/2010 - 16:31
Kx infinity focus problem
Accepting that auto focus is not perfect does anyone feel that either the KX or the K7 have done anything to improve on the results possible with the K10? Unlike all the other models, the K20D and K-7 enable AF adjustments to be set for individual lenses, and this can lead to better results when you...
Posted by iceblinker on 02/01/2010 - 16:49
Kx infinity focus problem
Glad to hear things have sorted out perfectly for you, nice start of the year. :)
Posted by Anvh on 02/01/2010 - 16:50
New K7 and my K10 bounces and lives
I think that -10 has worked ... it has certainly improved it!! Thanks. When you say manually focus it, does that make any difference? Because the AF looks correct in the view finder and isn't - surely manually focusing will be the same misleading image??
Posted by Bluewhistle2 on 02/01/2010 - 01:06
New K7 and my K10 bounces and lives
If the image looks shapr in the viewfinder and isn't on the sensor, then something is physically out of alignment. The mirror could be displaced or the focusing screen not seated correctly. If all is well, the manual focus image will be sharp and the viewfinder image will be sharp at the same time.
Posted by johnriley on 02/01/2010 - 11:17
