Search results for 'back focus' - page 1319
manual focus problems on k10d
Photos are at: http://www.flickr.com/photos/10737481@N06 The focusing chart shots were done with a 16-45mm on autofocus and the leaf shot was manual with a 90mm lens at f2.5. I manually went out of focus each time, then let the autofocus zero in on the centre bit. They were taken from about 1 met...
Posted by George Lazarette on 30/07/2007 - 12:55
manual focus problems on k10d
I had him hold a CD with text on it about an inch or two in front of his face and I focused on the text. After that all the pics were perfectly focused. But that isn't a precise measurement. A "held" item will be in reality waving about anywhere and everywhere. Your camera would need to be...
Posted by johnriley on 30/07/2007 - 14:02
manual focus problems on k10d
I had him hold a CD with text on it about an inch or two in front of his face and I focused on the text. After that all the pics were perfectly focused. But that isn't a precise measurement. A "held" item will be in reality waving about anywhere and everywhere. Your camera would need to be...
Posted by ChrisA on 30/07/2007 - 14:31
manual focus problems on k10d
Chris, I get very similar results as you with my FA 50mm 1:1.4 lens. The lower 2mm marker is sharper than the upper one. More testing to do . . . using a cable release this time.
Posted by Mannesty on 30/07/2007 - 16:30
manual focus problems on k10d
Chris, I get very similar results as you with my FA 50mm 1:1.4 lens. The lower 2mm marker is sharper than the upper one. Not entirely convinced. The CA shows green below and magenta above, so the lower one looks sharper, with the magenta above making it look less sharp. But I think the green blu...
Posted by ChrisA on 30/07/2007 - 16:41
manual focus problems on k10d
Having repeated the experiment with FA 50mm 1:1.4, FA 100mm Macro 1:2.8, FA 28-200mm lenses (all wide open) and a seismically rock solid tripod together with cable release . . . no focussing issues here. The 50mm produces slightly softer images wide open but that's expected from this lens. The 100mm...
Posted by Mannesty on 30/07/2007 - 17:02
manual focus problems on k10d
no focussing issues here. Interesting afternoon. Glad to hear your camera's Ok, Peter. A thought strikes me... with digital it's now incredibly easy to set up these quick tests, and just as easy to disseminate the results. A few years ago, when we were all using film, how many would have bo...
Posted by ChrisA on 30/07/2007 - 18:30
manual focus problems on k10d
I've now done the test more "rigorously", tripod, chart is flat, careful focusing and the results are all exactly the same as what I've been saying. Except the test shots with the IST DS, which are all perfectly sharp where they're supposed to be. Here's four shots http://www.flickr...
Posted by davidxgreen on 30/07/2007 - 19:39
manual focus problems on k10d
With respect, I'd urge you to look again at the shots you have posted as they are all askew. Different angles, magnifications, some twisted off axis, some not. But if in the end you are unhappy then return the k10D for examination by Pentax whilst it's still under warranty. I would check with the...
Posted by johnriley on 30/07/2007 - 19:47
manual focus problems on k10d
they were just as small so this is deleted
Posted by davidxgreen on 30/07/2007 - 19:47
manual focus problems on k10d
Try pinning the chart down flat and making sure it is parallell to the camera. Nothing should be moved between shots.
Posted by johnriley on 30/07/2007 - 19:50
manual focus problems on k10d
It's not a fault in the testing or my eyesight. The results are consistently out of focus on the k10d and in focus on the ist ds. Certainly if you're getting consistently different results with two cameras and that is the only variable, it suggests that at least one of them is duff. Forgive a dum...
Posted by ChrisA on 30/07/2007 - 20:24
manual focus problems on k10d
The real question has remained unanswered - are your images sharp? That is, your real pictures. Because if they are the error is not significant except for the photography of test charts. I'd disagree with this, John. If there's a problem, it will be worse wide open, which he'll often not be. So s...
Posted by ChrisA on 30/07/2007 - 20:37
manual focus problems on k10d
I don't know what you mean by the "green hexagon". Check out the manual, p136. Also p134, section 2. Also p131, section 2 (at the top). It's the only reliable way of knowing when the camera thinks it's in focus. You'll also get it at the bottom of the viewfinder when it's in AF an...
Posted by ChrisA on 30/07/2007 - 20:45
manual focus problems on k10d
What I don't understand is not noticing this before. Unless this sort of problem can "develop" (can it?). In answer to your questions Chris (not at all dumb as I don't know what you mean by the "green hexagon". Yes, I'm using the spot focusing setting not on 'Sel' I...
Posted by davidxgreen on 30/07/2007 - 20:40
manual focus problems on k10d
Well, I've done this test half a dozen times in the past. I've run this on pages of text and real objects. obviously wit tripod, etc... Maybe my methods were flawed in some way? :? So, today I downloaded the test chart, set everything up just right, and wouldn't you know my camera looks fine. ...
Posted by amoringello on 30/07/2007 - 22:20
manual focus problems on k10d
I've run this on pages of text and real objects. obviously with tripod, etc... Maybe my methods were flawed in some way? :? ... So, today I downloaded the test chart, set everything up just right, and wouldn't you know my camera looks fine. (Perhaps my methods today are flawed?? :twisted: ) [...
Posted by ChrisA on 31/07/2007 - 07:34
manual focus problems on k10d
Make sure that SR is turned off when using a tripod to make these tests. It occured to me that in his test shots, more of the image above (behind) the centre line is in focus than there is in front (below) but the actual centre line does appear to be in focus, as far as I can see anyway. Has hype...
Posted by Mannesty on 31/07/2007 - 08:41
manual focus problems on k10d
John has already mentioned that the test chart is not consistently straight and parallel to the lens axis which renders some of the shots less than conclusive. I'm not sure it does, in itself. Although the calibration on the chart won't correspond to reality (it's only right when it's straight an...
Posted by ChrisA on 31/07/2007 - 09:02
manual focus problems on k10d
What I don't understand is not noticing this before. Unless this sort of problem can "develop" (can it?). In answer to your questions Chris (not at all dumb as I don't know what you mean by the "green hexagon". Yes, I'm using the spot focusing setting not on 'Sel' I...
Posted by photo*ist on 31/07/2007 - 09:09
