Search results for 'back focus' - page 1593
Is 10 units of back focus unusual?
Smeggy I didn't think that the 'Apply All' and individual AF adjustments were cumulative? Do we have any proof that this is so, other than me doing another barrage of test (I think I might use sausages next time instead of batteries :-) !! ) Yes they are cumulative. I've tried it :) - I'm...
Posted by Smeggypants on 06/03/2011 - 17:50
Is 10 units of back focus unusual?
Could I show my ignorance...what is the three battery test? Does anyone know if there is a way of making any adjustments to the AF of a KX? If there isn't then I'll not be checking the AF! I agree about shutter speed and the clarity of the enlarged picture. No doubt at all the the SR on ...
Posted by Rataegeoff on 06/03/2011 - 20:48
Is 10 units of back focus unusual?
Hi Smeggy In spite of my sometimes 'love hate' relationship with the K5 and (18-135mm lens), it is mostly love, or at least admiration ... in case anyone thought I was 'having a go', which I wasn't - oh for more free time to play ... Lee
Posted by Sapphie on 06/03/2011 - 20:49
Is 10 units of back focus unusual?
3 battery test - I may have this all wrong, but place 3 batteries (AA size is ideal) on a table, at a 45 degree angle; line up your camera and lens so that they fill as much of the frame as possible, with the camera on a tripod and level with the batteries. Space the batteries far enough apart so th...
Posted by Sapphie on 06/03/2011 - 20:58
Is 10 units of back focus unusual?
Thanks for the responses; makes me feel slightly better. My questions now are: (a) where do I send my Pentax lenses for calibration? Been waiting - with interest, just where does one send a lens for calibration!! :roll:
Posted by mayday on 06/03/2011 - 21:31
Is 10 units of back focus unusual?
Thanks for the responses; makes me feel slightly better. My questions now are: (a) where do I send my Pentax lenses for calibration? Been waiting - with interest, just where does one send a lens for calibration!! :roll: You could send lens and camera to JP for matching together.
Posted by johnriley on 06/03/2011 - 21:32
Is 10 units of back focus unusual?
[quote:3496ace15f="Sapphie"]Thanks for the responses; makes me feel slightly better. My questions now are: (a) where do I send my Pentax lenses for calibration? Been waiting - with interest, just where does one send a lens for calibration!! :roll: You could send lens and camera to JP for match...
Posted by mayday on 06/03/2011 - 21:41
Is 10 units of back focus unusual?
[quote:3496ace15f="mayday"][quote:3496ace15f="Sapphie"]Thanks for the responses; makes me feel slightly better. My questions now are: (a) where do I send my Pentax lenses for calibration? Been waiting - with interest, just where does one send a lens for calibration!! :roll: You could send lens...
Posted by johnriley on 06/03/2011 - 21:44
Is 10 units of back focus unusual?
Your test, now that you have explained it is fundamentally flawed, IMO. You should be focussing on a flat plane not a cuved one, their are plenty of test charts out there. Secondly, you should be using maximum aperture not minimum. With a zoom lens you would use it at the tight end and, again,...
Posted by gartmore on 07/03/2011 - 06:58
Is 10 units of back focus unusual?
Ken Thanks. I'll give another go with a printed test chart. I had the 43mm at f2.8, I thought we had to shoot fairly wide open for these tests. With the zoom, by 'tight' end do you mean at the wide end? I was trying it around 35mm, so near the wide end but not widest. Sorry if I am being d...
Posted by Sapphie on 07/03/2011 - 09:03
Is 10 units of back focus unusual?
To be honest, why spend good money on test charts? When to take pictures, are they sharp? If they are, that's fine. Sometimes we worry too much instead of enjoying the photography. In many years of photography I have yet to find a lens that didn't focus where it was supposed to. On this basis...
Posted by johnriley on 07/03/2011 - 09:19
Is 10 units of back focus unusual?
You're mixing up some photographic terminology :wink: 'Wide open' or 'f2.8' is maximum aperture not 'minimum'. By 'tight' I mean fully zoomed in where depth of field is at its minimum. When I had a similar problem with my K20d I found that using a knot on a wooden window shutter to be far easier ...
Posted by gartmore on 07/03/2011 - 09:22
Is 10 units of back focus unusual?
Yvon Bourque has a good free test chart
Posted by Gwyn on 07/03/2011 - 09:25
Is 10 units of back focus unusual?
I've heard on multiple occasions that the AF adjustments are not cumulative. Also done brief tests on my own to confirm this was true. Interesting to hear they are indeed cumulative on Smeggy's cameras :) I also wonder how the AF microadjustment works on an MF lens (Your A50/1.2). Are you adjusti...
Posted by thoughton on 07/03/2011 - 10:55
Is 10 units of back focus unusual?
Tim, when I had my BF problem, the green hexagon was giving the wrong info, when I relied on it my pics at f1.4 were soft, when I ignored it they were spot on.
Posted by gartmore on 07/03/2011 - 12:16
Is 10 units of back focus unusual?
Good to know Ken. I also wonder does the camera remember an MF lens if it has the A setting? Or does it have to be the universal setting?
Posted by thoughton on 07/03/2011 - 13:09
Is 10 units of back focus unusual?
I've heard on multiple occasions that the AF adjustments are not cumulative. Also done brief tests on my own to confirm this was true. Interesting to hear they are indeed cumulative on Smeggy's cameras :) I think you'll find that the 'trick' is to use Debug mode to make the major, common, adjustment...
Posted by JohnX on 07/03/2011 - 13:23
Is 10 units of back focus unusual?
I've heard on multiple occasions that the AF adjustments are not cumulative. Also done brief tests on my own to confirm this was true. Interesting to hear they are indeed cumulative on Smeggy's cameras :) Well unless there was some error in my test I found adjusting the overall adjustment on my K-...
Posted by Smeggypants on 07/03/2011 - 14:52
Is 10 units of back focus unusual?
Good to know Ken. I also wonder does the camera remember an MF lens if it has the A setting? Or does it have to be the universal setting? Universal setting, Sadly it doesn't remember the lens.
Posted by Smeggypants on 07/03/2011 - 14:53
Is 10 units of back focus unusual?
Thanks for all the comments. It seems this subject is not as 'black and white' as one might think. The reason I am pursuing this is because I am not always 100% happy with my 'real world' image sharpness, so am just trying to understand why and if AF calibration is one thing to try, then so be it...
Posted by Sapphie on 07/03/2011 - 19:04
