Search results for 'back focus' - page 1746
Lens calibration - Focus Tune software
There is absolutely no way we can make any conclusion from a hand held test. I would wait before adjusting anything and start agin with a sturdy tripod and a carefully aligned subject.
Posted by johnriley on 28/04/2013 - 23:22
Lens calibration - Focus Tune software
John, some of my macro shots were missing the point of focus, like the stamens in a bloom and similar. By experimenting with the settings I worked out which setting put the matter right (by using that newspaper and the wordsearch.) Re-taking them after the adjustment they were much better, indeed sp...
Posted by JAK on 28/04/2013 - 23:33
Lens calibration - Focus Tune software
Just to go back to that software solution. If it doesn't have a dedicated Pentax output, it would still need a trial and error method to determine what actual adjustment is needed unless I'm missing something. Mostly many put up without making any adjustments to their lenses, if indeed it is prov...
Posted by JAK on 28/04/2013 - 23:58
Lens calibration - Focus Tune software
I don't understand the issue. The only variable can be the camera body (lens mount, AF sensor & focus screen alignments). The AF system from the SFX onwards (maybe the MEF for all I know) is supposed to continually feedback to get the least phase difference between the two 'halves' of the sensor (i....
Posted by johnha on 29/04/2013 - 00:09
Lens calibration - Focus Tune software
JAK, what would you think if Pentax adjusted their cameras and lenses by using a hand held test? I'm afraid you have to be precise if you are making measurements. Your adjustment is nowhere near precise. I only mention it because you are making changes based on some very error prone methodology.
Posted by johnriley on 29/04/2013 - 00:25
Lens calibration - Focus Tune software
There is absolutely no way we can make any conclusion from a hand held test. I would wait before adjusting anything and start agin with a sturdy tripod and a carefully aligned subject. If course you can. I do all my AF adjustments hand held. Why? Because it works. :) All this is being blo...
Posted by Smeggypants on 29/04/2013 - 00:35
Lens calibration - Focus Tune software
The cameras and lenses are built in a very precise manufacturing environment, any variations are going to be far less than any variables introduced by a 'user' test except using the most controlled laboratory tests. In the real world it doesn't work like that for AF adjusting. Teh fact is that ...
Posted by Smeggypants on 29/04/2013 - 00:40
Lens calibration - Focus Tune software
If that's the case, I'm not surprised that you adjust all your lenses.
Posted by johnriley on 29/04/2013 - 00:42
Lens calibration - Focus Tune software
JAK, what would you think if Pentax adjusted their cameras and lenses by using a hand held test? I'm afraid you have to be precise if you are making measurements. Your adjustment is nowhere near precise. I only mention it because you are making changes based on some very error prone methodology. ...
Posted by Smeggypants on 29/04/2013 - 00:43
Lens calibration - Focus Tune software
If that's the case, I'm not surprised that you adjust all your lenses. How do you mean 'not suprised' ? Anyway I don't adjust all my lenses. As said above some haven't needed adjustment. I do however check the AF on a every lens when I first purchase them. I did recheck them a few months ago as ...
Posted by Smeggypants on 29/04/2013 - 00:46
Lens calibration - Focus Tune software
JAK, what would you think if Pentax adjusted their cameras and lenses by using a hand held test? I'm afraid you have to be precise if you are making measurements. Your adjustment is nowhere near precise. I only mention it because you are making changes based on some very error prone methodology. ...
Posted by JAK on 29/04/2013 - 01:12
Lens calibration - Focus Tune software
When it comes to the K-5 Horizon correction feature, it might have helped if Pentax had tried some hand held test shots to make sure that works properly, and provide an adjustment for when it doesn't. I believe most users just turn that feature off. John K
Posted by JAK on 29/04/2013 - 01:19
Lens calibration - Focus Tune software
When it comes to the K-5 Horizon correction feature, it might have helped if Pentax had tried some hand held test shots to make sure that works properly, and provide an adjustment for when it doesn't. I believe most users just turn that feature off. John K I never use it. I correct anything in li...
Posted by Smeggypants on 29/04/2013 - 01:26
Lens calibration - Focus Tune software
I doubt anyone uses it, it doesn't work (which is actually a shame!)
Posted by JAK on 29/04/2013 - 01:28
Lens calibration - Focus Tune software
JAK, what would you think if Pentax adjusted their cameras and lenses by using a hand held test? I'm afraid you have to be precise if you are making measurements. Your adjustment is nowhere near precise. I only mention it because you are making changes based on some very error prone methodology. ...
Posted by Smeggypants on 29/04/2013 - 01:31
Lens calibration - Focus Tune software
"I don't think teh increments can represent anything other than teh amount of micrometers the AF sensor moves by. Each lesne, focal distance, etc, will be different to how much this applies to a certain distance out of focus anyway" hang on a mo, let's think about this... AF sensor can't move,...
Posted by dpm on 29/04/2013 - 07:48
Lens calibration - Focus Tune software
" AF sensor can't move, can it? Image sensor can't move fore/aft either. AF mirror- and therefore path length0 *could* move if the main mirror is stopped by a servo rather than a hard stop. Dunno if this is the case. My understanding is the the micro adjustment does indeed move the sensor back an...
Posted by McBrian on 29/04/2013 - 10:07
Lens calibration - Focus Tune software
Jak and Smeggy must have 20/20 vision, something I would dearly love to have :) Not sure what you are getting at here. John K
Posted by JAK on 29/04/2013 - 10:14
Lens calibration - Focus Tune software
Jak and Smeggy must have 20/20 vision, something I would dearly love to have :) Not sure what you are getting at here. John K Missed a sentance, might make more sense now :oops:
Posted by McBrian on 29/04/2013 - 10:15
Posted by JAK on 29/04/2013 - 10:17
