Search results for 'back focus' - page 1744
Lens calibration - Focus Tune software
Seems a lot of work..... several shots at each ADJ value :shock: It's cheap though at £20. I wish I knew the algorithmn they are using. It could be largest file size, but unlikely and it isn't that accurate. There is a fully auto program (UK made) for Canon, been out some time. The softw...
Posted by JohnX on 27/04/2013 - 11:01
Lens calibration - Focus Tune software
That does seem like a lot of work and I'm not sure you'd end up with a different result than if you'd used a page of newsprint or a cornflake box, especially if it has a word search puzzle on the back. I'm sure that program was written by a former civil servant! Having to take shots in quadruplicat...
Posted by JAK on 27/04/2013 - 11:14
Lens calibration - Focus Tune software
That does seem like a lot of work and I'm not sure you'd end up with a different result than if you'd used a page of newsprint or a cornflake box, especially if it has a word search puzzle on the back. I'm sure that program was written by a former civil servant! Having to take shots in quadruplicat...
Posted by JohnX on 27/04/2013 - 11:28
Lens calibration - Focus Tune software
Very interesting, it has something in common the way it works with Imatest, used by EPZ and others for lens testing. That should do the trick very nicely and produce better results more easily than what we have been doing up to now. It's worth noting that spurious values do appear and that's ...
Posted by johnriley on 27/04/2013 - 11:47
Lens calibration - Focus Tune software
I suppose the 'beauty' of the software is that it takes me out of the equation. Could I tell the difference by eye between a shot at -2 adjustment and one at -3? What about AF drift? And as to lot of work, just how long does it take to reel off 4 shots per adjustment? At the end of it, however, ...
Posted by JAK on 27/04/2013 - 11:55
Lens calibration - Focus Tune software
I have nightmares of making everything worse.:shock: Perhaps I should start by having my eyes tested :) Is there somewhere that demonstrates the ideal set-up for adjusting a lens ? I usually just wait for another person to tell me " it's a bit soft " :)
Posted by tyronet2000 on 27/04/2013 - 12:57
Lens calibration - Focus Tune software
I usually just wait for another person to tell me " it's a bit soft " :) That's called colaboration Stan, not calibration. :D
Posted by Mannesty on 27/04/2013 - 13:02
Lens calibration - Focus Tune software
I usually just wait for another person to tell me " it's a bit soft " :) That's called colaboration Stan, not calibration. :D And then I suffer exasperation :roll: :(
Posted by tyronet2000 on 27/04/2013 - 13:07
Lens calibration - Focus Tune software
There's no doubt that it's possible to get a bit obsessive about lens calibration. I'm sure there's more need for it now with more complex lenses and possibly more batch testing that keeps costs down, but so far all my lenses and images look sharp and enlarge still looking sharp. That being the c...
Posted by johnriley on 27/04/2013 - 13:21
Lens calibration - Focus Tune software
That does seem like a lot of work and I'm not sure you'd end up with a different result than if you'd used a page of newsprint or a cornflake box, especially if it has a word search puzzle on the back. I'm sure that program was written by a former civil servant! Having to take shots in quadruplicat...
Posted by Smeggypants on 27/04/2013 - 18:47
Lens calibration - Focus Tune software
But in order to calibrate your lenses manually you'd be taking a fair number of shots anyway wouldn't you? well sure but using the cornflake pack method you just 'shoot em', 'look at 'em', and 'delete 'em'.
Posted by Smeggypants on 27/04/2013 - 18:49
Lens calibration - Focus Tune software
That does seem like a lot of work and I'm not sure you'd end up with a different result than if you'd used a page of newsprint or a cornflake box, especially if it has a word search puzzle on the back. I'm sure that program was written by a former civil servant! Having to take shots in quadruplicat...
Posted by Smeggypants on 27/04/2013 - 18:54
Lens calibration - Focus Tune software
Could I tell the difference by eye between a shot at -2 adjustment and one at -3? Yes you would, or you certainly should be able to. You might even wish for a -2½ setting. What about AF drift? The software package would only take into account the shots taken during the test. So if it is an issue ...
Posted by JAK on 27/04/2013 - 19:22
Lens calibration - Focus Tune software
This was my test with the DFA 100mm f2.8 macro on the K-5: I focussed on the line 'However Nurse Todd' but the image would lead you to believe it was three lines up from that as it was back focussing. After dialling in a +4 adjustment I got this: Which is what I should have got the fi...
Posted by JAK on 27/04/2013 - 19:55
Lens calibration - Focus Tune software
It's that simple! John K It is indeed. In practice I take a few at different focal distances as well, but I just look at them on the LCD screen adn delete them
Posted by Smeggypants on 27/04/2013 - 20:32
Lens calibration - Focus Tune software
The software will not tell you what setting you need to enter into the camera to put the AF right, you'll still need to experiment to get it correct. Have you watched the video or am I missing/missunderstanding something? my understanding is this is precisely what the software does tell you. If y...
Posted by McBrian on 27/04/2013 - 20:35
Lens calibration - Focus Tune software
Is the software camera specific? If it is it might show the correct number to dial in, if it isn't then it probably won't. Some cameras have different gaps and a -20 to + 20 range. John K Edit: Yes I did watch a few minutes of it but got bored, it seemed so much effort for something so simple...
Posted by JAK on 27/04/2013 - 20:47
Lens calibration - Focus Tune software
The software will not tell you what setting you need to enter into the camera to put the AF right, you'll still need to experiment to get it correct. Have you watched the video or am I missing/missunderstanding something? my understanding is this is precisely what the software does tell you. You hav...
Posted by Mannesty on 27/04/2013 - 22:32
Lens calibration - Focus Tune software
This was my test with the DFA 100mm f2.8 macro on the K-5: I focussed on the line 'However Nurse Todd' but the image would lead you to believe it was three lines up from that as it was back focussing. After dialling in a +4 adjustment I got this: Which is what I should have got the fi...
Posted by McBrian on 28/04/2013 - 09:39
Lens calibration - Focus Tune software
Is the software camera specific? If it is it might show the correct number to dial in, if it isn't then it probably won't. Some cameras have different gaps and a -20 to + 20 range. John K Edit: Yes I did watch a few minutes of it but got bored, it seemed so much effort for something so simple...
Posted by McBrian on 28/04/2013 - 09:41
