Search results for 'back focus' - page 1748
Lens calibration - Focus Tune software
Are you really arguing that it doesn't matter if you don't do the job properly?
Posted by johnriley on 29/04/2013 - 16:57
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 Smeggypants on 29/04/2013 - 17:03
Lens calibration - Focus Tune software
Are you really arguing that it doesn't matter if you don't do the job properly? Of course I'm not. I'm arguing that to do the job properly you don't need focus charts, tripods or software
Posted by Smeggypants on 29/04/2013 - 17:05
Lens calibration - Focus Tune software
You clearly won't be buying it then Mr S....:) I wouldn't even use a freeware version :)
Posted by Smeggypants on 29/04/2013 - 17:05
Lens calibration - Focus Tune software
Well we have an intelligent audience here, so they can make up their own minds I'm sure.
Posted by johnriley on 29/04/2013 - 17:42
Lens calibration - Focus Tune software
Well we have an intelligent audience here, so they can make up their own minds I'm sure. I agree, which is why there's nothing dangerous about adjusting the AF parameter :)
Posted by Smeggypants on 29/04/2013 - 17:48
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. You are [missing something]. All the software needs is 4 shots at each possible adjustm...
Posted by Mannesty on 29/04/2013 - 18:01
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. You are [missing something]. All the software needs is 4 shots at each possible adjustm...
Posted by JAK on 29/04/2013 - 18:15
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. You are [missing something]. All the software needs is 4 shots at each possible adjustm...
Posted by Smeggypants on 29/04/2013 - 18:19
Lens calibration - Focus Tune software
I posted a link sometime back to a very simple way of doing the AF ADJ on Ricehigh's site. I can't find it at present, but anyone with half a brain could easily figure it out for themselves :shock: '
Posted by Algernon on 29/04/2013 - 18:28
Lens calibration - Focus Tune software
There's no need to take 84 images ( including uploading them to computer, renaming them, etc,etc ). It's obvious that most settings are going to be way out of focus. I know that there was no need to take so many images, but I wanted to, partly influenced by the torrential rain we had yesterday and...
Posted by Mannesty on 29/04/2013 - 18:43
Lens calibration - Focus Tune software
How would you check the focus at infinity? Not possible since infinity does not exist :lol: But photographically speaking you'd need a very large target to focus on and placed several miles from your camera, so probably not worth the trouble.
Posted by Mannesty on 29/04/2013 - 18:45
Lens calibration - Focus Tune software
There's no need to take 84 images( including uploading them to computer, renaming them, etc,etc ). It's obvious that most settings are going to be way out of focus. I know that there was no need to take so many images, but I wanted to, partly influenced by the torrential rain we had yesterday and ...
Posted by Smeggypants on 29/04/2013 - 18:54
Lens calibration - Focus Tune software
Well I am retired y'know :lol:
Posted by Mannesty on 29/04/2013 - 18:58
Posted by JAK on 29/04/2013 - 18:59
Lens calibration - Focus Tune software
The AF adjustment is nothing to do with the Image sensor The AF sensor is mechanically adjustable via a screw(s) under the baseplate. however I think, and I'm not 100% sure on this, that the AF parameter in the custom menu doesn't physically move the AF sensor but rather applies a relative adjust...
Posted by McBrian on 30/04/2013 - 11:52
Lens calibration - Focus Tune software
I've had a quick scan through this thread and nowhere have I seen mention of one of the biggest factors I've found contributing to erratic focussing on my K-5, namely whether focus is approached from the long end or the short end. On my K-5 the difference is about 4 steps of AF adjustment. I fin...
Posted by WaypointCharlie on 02/05/2013 - 17:48
Lens calibration - Focus Tune software
Retested the 100mm macro on the K-3 last night, that lens that was back focussing on the K-5, using the same cornflake packet with the word search centered on the middle O! This time the focusing was bang on; no need for any adjustment this time. Sorry if that isn't a very scientific test but it wor...
Posted by JAK on 07/11/2013 - 10:56
Lens calibration - Focus Tune software
Interesting. I've still got focussing issues on my lenses with the K5-IIs. The main problem I have is with zoom lenses because the required micro focus adjustment can vary with focal length. The worst example is the DA 18-250mm which needs about +10 to compensate for back focus at 250mm but need...
Posted by WaypointCharlie on 02/12/2013 - 12:46
Lens calibration - Focus Tune software
Sounds like a focussing issue with that particular lens, so I doubt it. A K-3 may even make the problem seem worse if you pixel peep. John K
Posted by JAK on 02/12/2013 - 12:55
