Search results for 'back focus' - page 1463
K10 focus check
I have adjusted my K10 twice. Initially after approx 1000 actuations and then again after approx 7500 actuations. This would seem to support the view that a certain amount of 'bedding in' has occured, though I accept this is far from proven. Very interesting information, thanks, Steve. I did wond...
Posted by stevejcoe on 02/09/2009 - 14:50
K10 focus check
Hi Guys. This is really a very interesting (to me anyway) thread. Could someone tell me if the adjustments are only going to affect AF. In other words if I manually focus the results should not change before and after adjustment? Thanks geoff
Posted by Rataegeoff on 02/09/2009 - 17:42
K10 focus check
Could someone tell me if the adjustments are only going to affect AF. In other words if I manually focus the results should not change before and after adjustment? I don't think the way the AF system works out whether the shot is in focus is any different whether you focus it manually, or allow t...
Posted by ChrisA on 02/09/2009 - 18:46
K10 focus check
Could someone tell me if the adjustments are only going to affect AF. In other words if I manually focus the results should not change before and after adjustment? I don't think the way the AF system works out whether the shot is in focus is any different whether you focus it manually, or allow t...
Posted by stevejcoe on 02/09/2009 - 18:48
K10 focus check
When you focus manually you focus until the image is at its sharpest on the ground glass. The distance from the ground glass and from the sensor have to be the same and fixed, otherwise all shots would be off. Therefore I'd suppose that the change being made is to the AF calibration so that its f...
Posted by johnriley on 02/09/2009 - 19:00
K10 focus check
At the severe risk of seeming simplistic can I ask why such adjustments have to be made at all - or is this an advantage of digital over the old film slrs? Could one say that if any adjustments are required (eg due to less than expected image quality) then this is indicative of a manufacturing fa...
Posted by Rataegeoff on 02/09/2009 - 22:20
K10 focus check
The answer to the last question is yes, it applies to all marques, but only Pentax and Nikon supply a user solution. It was a problem in film cameras too, but one of film flatness, and not that well recognised. The problems in digital are different and also exacerbated by us looking at our ima...
Posted by johnriley on 02/09/2009 - 23:04
K10 focus check
When you focus manually you focus until the image is at its sharpest on the ground glass. The distance from the ground glass and from the sensor have to be the same and fixed, otherwise all shots would be off. Therefore I'd suppose that the change being made is to the AF calibration so that its f...
Posted by stevejcoe on 03/09/2009 - 09:25
K10 focus check
Very interesting test, many thanks for sharing the results.
Posted by johnriley on 03/09/2009 - 09:31
K10 focus check
Just a point when doing AF adjustments: you should always move the lens waaaay out of focus before getting the camera to AF ;) I normally shift to infinity before AF-ing on the test target. The 50/1.4 can be a pain to adjust anyway. It's field isn't flat, and I've found a combination of test targ...
Posted by MattMatic on 03/09/2009 - 09:51
K10 focus check
For closeup or portrait work when shooting with large apertures, then I will to switch to manual focus and use the screen and my eyes rather than relying on the green hexagon. As John says, very interesting, Steve. I noticed some time ago, when taking pictures of the moon, that accuracy of focu...
Posted by ChrisA on 03/09/2009 - 09:54
K10 focus check
As a matter of curiousity I just carried out a limted test using the same methodology , but this time with my MZ6. I will not document all of the results, but it certainly seems like there is less 'tolerance' with the MZ6. DA 16-45 F4 @ 24mm 2-3mm of focus movement DA 16-45 F4 @ 45 1mm FA 50 ...
Posted by stevejcoe on 03/09/2009 - 10:31
K10 focus check
There's definitely variability in the equipment and in the process (tripod position, distance, ambient temperature, dust in the lens mount, etc.). Not sure what you're getting at with this point, sorry. It is important to switch the SR to off when on a tripod (now I'm not suggesting for one m...
Posted by El Dingo on 03/09/2009 - 10:51
K10 focus check
Just a point when doing AF adjustments: you should always move the lens waaaay out of focus before getting the camera to AF ;) I normally shift to infinity before AF-ing on the test target. The 50/1.4 can be a pain to adjust anyway. It's field isn't flat, and I've found a combination of test targ...
Posted by El Dingo on 03/09/2009 - 10:56
K10 focus check
Just a point when doing AF adjustments: you should always move the lens waaaay out of focus before getting the camera to AF ;) I normally shift to infinity before AF-ing on the test target. The 50/1.4 can be a pain to adjust anyway. It's field isn't flat, and I've found a combination of test targ...
Posted by stevejcoe on 03/09/2009 - 11:17
K10 focus check
If you are struggling to get good sharp results with your K10 I think i can suggest that with this camera, regardless of the lens, the multipoint focus system is a bit painful. After a bit of shooting with high quality lenses, I have found that you will get far better results from just shooting in c...
Posted by mattox on 04/09/2009 - 13:52
K10 focus check
I agree with what he said above. Also if in doubt I always focus on something far away or near and then refocus ie make it work. Mike
Posted by mikew on 04/09/2009 - 17:12
K10 focus check
The comment about the multipoint focussing is really relevant. I did conclude that I could both get better shots and have more control if I used the centre point for focussing. I also now use the AF button rather than the half press of the shutter. This seems to give faster response and instant s...
Posted by Rataegeoff on 04/09/2009 - 21:32
K10 focus check
but SR stays on with cable remote without 2 sec. delay (as I found out when I tried this procedure the first time!). This appears to be in direct conflict with the manual, then, which says: Can you explain how you established that SR was still on with the cable remote? I don't have one, s...
Posted by ChrisA on 05/09/2009 - 01:03
K10 focus check
'Remote control shooting' probably refers to using the infra-red remote release, not the wired one. Dan
Posted by Daniel Bridge on 05/09/2009 - 19:04
