Search results for 'back focus' - page 1996
focus adjustment k10d
I think that the fact that Pentax have allowed this adjustment in the K20D, and that they've allowed various offsets to be stored for different lenses, that this is now a recognised problem. Why then can we not have a firmware update to the other bodies to allow the same? I can't even estimate...
Posted by Mannesty on 31/07/2008 - 21:38
focus adjustment k10d
Well I guess that if we are talking about adjustments of microns, that not all lenses are made to exact micron tolerances? They would probably have to be within an acceptable range, so perhaps this is why all lenses are different? I've not done much 'proper' testing, but with just shooting a 'liv...
Posted by Unlocker on 01/08/2008 - 00:05
focus adjustment k10d
It's fascinating how these new problems crop up after years of it never being mentioned. If it's a problem with Pentax then I wouldn't be surprised if it isn't a problem with Nikon and Canon as well. Fortunately my focusing seems fine. It would be IMHO intolerable to have to contemnplate constant...
Posted by johnriley on 01/08/2008 - 00:26
focus adjustment k10d
If they really are talking about adjustments of microns I can not see how the mating accuracy of the K-mount would be good enough. If it was that critical then you would need to re-calibrate every time you changed the lens – even taking the a lens off the camera and immediately re-attaching would ch...
Posted by Dave_Evanson on 01/08/2008 - 00:45
focus adjustment k10d
The adjustment in microns is with regard to the sensor, not the lens ;) And it will be with regard to the AF-sensor, not the CCD too (though with the CCD effectively fixed that amounts to pretty much the same thing). Matt
Posted by MattMatic on 01/08/2008 - 06:52
focus adjustment k10d
But the CCD is not fixed anymore. Is this a possible cause of this new situation? Maybe the SR system means that there is more room for error than there used to be. I wonder if there has been a test made of absolute sharpness vs reduction in camera shake or whether there has been a trade-off.
Posted by johnriley on 01/08/2008 - 07:54
focus adjustment k10d
If they really are talking about adjustments of microns I can not see how the mating accuracy of the K-mount would be good enough. If it was that critical then you would need to re-calibrate every time you changed the lens – even taking the a lens off the camera and immediately re-attaching would ch...
Posted by iceblinker on 01/08/2008 - 08:29
focus adjustment k10d
I wonder if there has been a test made of absolute sharpness vs reduction in camera shake or whether there has been a trade-off. Very interesting point, John. To test this, fast shutter speeds would be needed, to guarantee that there was no shake in the image when SR was off. This would be true ...
Posted by ChrisA on 01/08/2008 - 08:58
focus adjustment k10d
But the CCD is not fixed anymore. Is this a possible cause of this new situation? Maybe the SR system means that there is more room for error than there used to be. I wonder if there has been a test made of absolute sharpness vs reduction in camera shake or whether there has been a trade-off. Int...
Posted by hefty1 on 01/08/2008 - 11:13
focus adjustment k10d
We're all speculating, of course. Sort of related to this was a question in last week's AP which asked why manufacturers don't put levelling lines in the viewfinders of their DSLRs. We could then all avoid those sloping horizons! The answer is probably not the one given in AP, but perhaps more to...
Posted by johnriley on 01/08/2008 - 12:34
focus adjustment k10d
In my case the only noticeable focus problems I’ve had are with old K series lenses, but that’s probably more down to technique – relying too much on the focus indicator in the viewfinder and not concentrating on the image. The four modern lenses I have, 24/90mm 16/45mm, DFA 100mm macro and the D...
Posted by Dave_Evanson on 01/08/2008 - 13:36
focus adjustment k10d
We're all speculating, of course. Sort of related to this was a question in last week's AP which asked why manufacturers don't put levelling lines in the viewfinders of their DSLRs. We could then all avoid those sloping horizons! I have a standard, unmodified K10D. I can count six features in t...
Posted by ChrisA on 01/08/2008 - 13:45
focus adjustment k10d
Not having played with the debug mode I guess there are settings available which could well and truly mess things up, this is probably why Pentax are reluctant to let users access debug mode. It could be that allowing access to focus calibration while protecting the camera from damage is not so easy...
Posted by iceblinker on 01/08/2008 - 14:36
focus adjustment k10d
Why anyone would need any more than this to get their horizons horizontal is beyond me. Perhaps the question we should be asking is why do so many images we see have sloping horizons? Even magazines and books have plenty of examples. Does no-one notice? :?:
Posted by johnriley on 01/08/2008 - 16:35
focus adjustment k10d
A quick update: I noticed that my K10D was indeed 'back focussing' and have used the 'Russian' software (with firmware 1.30 on my K10D) to get into debug mode and correct this. The English language version of the software does not appear to install correctly - when I tried to run the program...
Posted by El Dingo on 27/05/2009 - 13:27
Cooling problems
Hi All, I have a Pentax K10d and various lenses.. When I take a photograph of a scene with a lot of green in I tend to have to "cool" it down in photoshop as they always seem to have a yellow tint to it... This happens with both RAW and JPG I have tried setting the white balance on Auto/daylight ...
Posted by PeteWelshPhotography on 24/07/2008 - 23:08
Cooling problems
OK I have seen the photos - I went to http://www.petewelsh-photography.co.uk/petes and from there (it is a root directory) I could open the photos. I would say that John is spot on in his diagnosis. How strange. Now that I've visited the photos successfully using your method, the original links wor...
Posted by ChrisA on 25/07/2008 - 09:04
Cooling problems
How strange. Now that I've visited the photos successfully using your method, the original links work for me too. _______ Edit: though if I restart the browser and refresh the page, I'm back to the original error. Don't understand that :( Me too. I don't get it either but then I am not very good ...
Posted by Gwyn on 25/07/2008 - 09:20
noise at iso100
Mike, To be honest, I can't see any noise in those shots! :shock: What I do see is that you've shown the out-of-focus areas in each shot - that creamy, blurry look is not noise, but the bokeh of the lens. Noise would appear as a fine speckle - like grain on film. The quality, and quantity, of n...
Posted by MattMatic on 30/07/2008 - 07:20
noise at iso100
I am enjoying the comments than you very much. When I bought the da 70mm lens after I noticed that the images were out of focus which was so annoying as this lens is supposed to be pro quality according to some reviews and also for me it was expensive. So over the last month I have had my camera/l...
Posted by kiwao on 31/07/2008 - 05:26
