Search results for 'back focus' - page 1405
To K20D or not to K20D - that is the question?
Pentax film auto-focus lenses are all auto-exposure as well, and fully compatible with the K20D in all its modes. Most of the prime ones are very good and well worth using still. Many of the old zooms, though, don't compete well with modern ones in terms of image quality, particularly at large apert...
Posted by iceblinker on 03/03/2009 - 14:33
Focus problem in MF
Hi. Lately I've been working more and more wiht MF lenses on my K10D and I'm noticing that the focus is off. I hadn't really noticed it before, but lately its quite apparent. Do I have to send it to Pentax (and do I do that?) or is it something I can fix by myself? Thanks
Posted by edumad on 04/03/2009 - 08:41
Focus problem in MF
Seems a common problem with all DSLR's. Just not made to the same standards that the old SLR's were. Do a search on Google. Lot of info on Rice Highs site. shim
Posted by shim on 04/03/2009 - 09:05
Focus problem in MF
Do you've adjusted the diopter correctly? point the camera at a blank wall and adjust the diopter till you can read the the information/camera settings clearly.
Posted by Anvh on 04/03/2009 - 11:47
Focus problem in MF
I'm noticing that the focus is off. Do you mean: 1. Photo is out of focus when image appears in focus through the viewfinder (on the focusing screen)? 2. Photo is out of focus when the focus indicator (green hexagon) indicates that the image is in focus? 3. Something else?
Posted by iceblinker on 04/03/2009 - 12:18
Focus problem in MF
The focus indicator comes up, it seems focused to me (although I do wear glasses and really need the diopter adjustment. It doesnt focus on the spot it should. I'll do some shots to show with different lenses.
Posted by edumad on 05/03/2009 - 10:05
Focus problem in MF
For some subjects, the focus indicator will be inaccurate and then you can focus better by ignoring it. The image should be sharp though when it is sharp on the viewfinder. There could be some misalignment with the focusing screen, AF system or sensor, but then I would expect the problem with AF ...
Posted by iceblinker on 05/03/2009 - 13:00
Focus problem in MF
I think the focus indicator does a pretty good job when it beeps (just some time it doesn't beep...:P) I checked my diopter, its correct. I checked my decision against focus detector... same result: With SMC-A 50mm F1.7 @F2 (I believe) trying to focus on the "78". With the Tokina SD 70-210...
Posted by edumad on 06/03/2009 - 02:08
Focus problem in MF
If the "78" in your first example was sharp in the viewfinfer then something in the camera is misaligned. I'm not sure whether that would be the focusing screen, or the sensor, or possibly both. It's probably happening with any AF lenses you have as well, but it isn't so noticeable with slower le...
Posted by iceblinker on 06/03/2009 - 03:35
Focus problem in MF
I'm thinking you are right about the misalignments. I hadn't use anything very fast in AF, and certainly not close (shallower DoF). Although it puzzles me why it would be wrong if in the viewfinder it shows up correctly... Is the viewfinder at a different distance than it should be from the mirror?...
Posted by edumad on 06/03/2009 - 08:47
Focus problem in MF
If the image is sharp on the focusing screen but not on the sensor, then there is a misalignment of the two. Have you cleaned the mirror, the focusing screen or changed the focusing screen? These things should never be touched unless you have the correct equipment and knowledge. Alternatively, th...
Posted by johnriley on 06/03/2009 - 09:17
Focus problem in MF
What I find odd about this is that yours focuses in front whereas mine focuses behind. If it was a common manufacturing fault I would have expected it to be all in the same direction. All you can do is bracket a few shots at different distances. It's not too bad if it's always in front. I use a focu...
Posted by shim on 06/03/2009 - 09:34
Focus problem in MF
Interesting point about screen brightness - many people who use Beattie screens actually find them brighter but harder to focus accurately.
Posted by johnriley on 06/03/2009 - 09:46
Focus problem in MF
I'm thinking you are right about the misalignments. I hadn't use anything very fast in AF, and certainly not close (shallower DoF). Although it puzzles me why it would be wrong if in the viewfinder it shows up correctly... Is the viewfinder at a different distance than it should be from the mirror?...
Posted by iceblinker on 06/03/2009 - 10:29
Focus problem in MF
I don't have any problems with the *ist DS which has a different screen. I'm not sure if they are interchangeable. Yes, they are. EDIT: Please see my reply below.
Posted by iceblinker on 06/03/2009 - 10:32
Focus problem in MF
I don't have any problems with the *ist DS which has a different screen. I'm not sure if they are interchangeable. Yes, they are. I always thought they were, but there's a tutorial on the web of someone putting an MX screen in a K10 and he found the DL screen to be bigger so possibly the DS and DL a...
Posted by shim on 06/03/2009 - 11:00
Focus problem in MF
Sorry, I misunderstood. By "interchangeable" I was thinking of just "changeable", as in the screen can be changed. The K10D and DS take the same size of screen, but the K10D's LF80 is brighter than the DS's LF60. In fact the brighter screen is nice in the DS, though there is a slight metering err...
Posted by iceblinker on 06/03/2009 - 11:11
Focus problem in MF
I did use one of those cheap chinese screen for a bit. Too dark, not the blackout problem, that allways happens. Just too dark all the time. I think I did evertyhing allright, but I'll check. I think it'll have to be Katzeyes with optibright for me... Ouch my wallet.
Posted by edumad on 08/03/2009 - 22:30
Pentax MF Camera to be released?
Yea, it would put Pentax right back up there with the "big boys". It would also kill any hopes I had of eventually picking up a "cheap" 645n, or rather, glass for a cheap 645n.:cry:
Posted by MarkD on 04/03/2009 - 21:54
Pentax MF Camera to be released?
Yea, it would put Pentax right back up there with the "big boys". It would also kill any hopes I had of eventually picking up a "cheap" 645n, or rather, glass for a cheap 645n.:cry: Don't worry, when the price of the 645D is announced, all those dreamers who picked up 645n's and 645 lenses will rea...
Posted by RichardDay on 05/03/2009 - 11:34
