Search results for 'back focus' - page 1124
17-70mm focusing issues
When I had the 17-70 I found that the incredibly light-weight focus ring caused the camera to over and undershoot focus. Gently resting a finger on the focus ring to dampen the loop stopped the hunting. YMMV. Matt
Posted by MattMatic on 07/02/2014 - 12:01
The 50mm 1.8 - anyone got an opinion?
I think mine are out of the camera!!! The colour is good from this and the DA35 This is a f1.8, caveats, 1) he was toddling towards me and focus was difficult 2)it's the first RAW I've processed it with RawTherapee 3) the light was flat as a pancake. 4) its not meant to be the best demo of the ...
Posted by dougf8 on 08/02/2014 - 23:36
SDM or not?
Hey there! For some years I was a nikon user, bit changed to a pentax, with a Pentax K3. I'm very happy with the camera, but have my doubts concerning the lenses available. For many years other brands replaced their screw driven auto-focus lenses for in-built motors. This means, among other th...
Posted by Delhaye on 09/02/2014 - 11:49
SDM or not?
Historically, Pentax have been very slow to bring out fast-focusing, quiet lenses. That's all it is, really. It's unfortunate that until the K-3, quick autofocus was never one of Pentax's main priorities, so I guess the pressure to update the lens range to address this specific issue was never t...
Posted by ChrisA on 09/02/2014 - 12:56
AF Adjustment
This is exactly the sort of post that makes the mind boggle that AF adjustment on a per-lens basis was not included as a matter of course on all camera models since the inception of DSLR photography. And it would be so simple to make this self-calibrating - focus in contrast detect, switch to phase ...
Posted by kh1234567890 on 10/02/2014 - 17:26
AF Adjustment
As an aside, was there any form of focus adjustment on the K-100d? I'm using this again whilst my K-30 is being looked at and it back focuses horribly :cry: Edit: just googled this on the bus to work. Seems a special service menu is the only way and it's a global setting for all lenses. Might ...
Posted by richandfleur on 10/02/2014 - 19:33
AF Adjustment
As an aside, was there any form of focus adjustment on the K-100d? I'm using this again whilst my K-30 is being looked at and it back focuses horribly :cry: Edit: just googled this on the bus to work. Seems a special service menu is the only way and it's a global setting for all lenses. Might ...
Posted by Jonathan-Mac on 10/02/2014 - 21:17
AF Adjustment
This is exactly the sort of post that makes the mind boggle that AF adjustment on a per-lens basis was not included as a matter of course on all camera models since the inception of DSLR photography. And it would be so simple to make this self-calibrating - focus in contrast detect, switch to phase ...
Posted by Smeggypants on 11/02/2014 - 06:12
AF Adjustment
[quote:3496ace15f="Jonathan-Mac"]This is exactly the sort of post that makes the mind boggle that AF adjustment on a per-lens basis was not included as a matter of course on all camera models since the inception of DSLR photography. And it would be so simple to make this self-calibrating - focus in ...
Posted by richandfleur on 11/02/2014 - 07:36
AF Adjustment
[quote:3496ace15f="kh1234567890"][quote:3496ace15f="Jonathan-Mac"]This is exactly the sort of post that makes the mind boggle that AF adjustment on a per-lens basis was not included as a matter of course on all camera models since the inception of DSLR photography. And it would be so simple to make ...
Posted by stevejcoe on 11/02/2014 - 08:43
AF Adjustment
So to expand on this idea I would like the option to save at least three AF adjustments per lens. I think Sony or Olympus have multiple focus points per lens as well. And of course the Sigma dock allows you to do it, except they don't make the dock for pentax fit lenses.
Posted by ambient housewife on 11/02/2014 - 09:21
AF Adjustment
I have had my da*200 for a 6 months now. Recently the images have seemed a little soft so I thought maybe I should adjust focus. Using a printed focus chart, tripod , 2 sec timer, shot at 45 degrees I found that +7 was needed and it seemed better. Then I read this post and realized that when I did t...
Posted by kiwao on 12/02/2014 - 05:12
AF Adjustment
With the current trend to more and more phase detect autofocus points shouldn't one be adjusting and calibrating each individual focus point separately and at every zoom and focus distance setting ? I just set up my lenses at infinity because that is where I find mis-focus most annoying. They all...
Posted by kh1234567890 on 12/02/2014 - 10:17
AF Adjustment
Lenses are computed to be at an optimum at the distances they are expected to be used at. A macro lens at close distances, a long telephoto presumably at long distances. A portrait lens at the appropriate distance. There's no perfect lens and some even say in the instructions if used close, use s...
Posted by kiwao on 12/02/2014 - 10:22
AF Adjustment
Zoom lenses in particular will drift as you zoom. There are very few true zooms these days, that is parfocal zooms that hold focus as we zoom. Most are varifocal and need to be refocused after zooming. Prime lenses also vary as we focus and can actually also change focal length. This is especiall...
Posted by johnriley on 12/02/2014 - 11:02
AF Adjustment
At last a fine day. I could do the test outside at 30m on a tripod with 2 sec timer with flat high contrast target. again using the dot-tune method. This time got consistent results refocusing several times. -2 to +9 when refocused from infinity and -4 to +8 when refocused the other way which g...
Posted by kiwao on 13/02/2014 - 21:08
AF Adjustment
Guilty too, you can't calibrate a zoom as it changes throughout the range. My DA15mm Ltd is my only prime and works fine. I thought calibration was introduced to adjust very old lenses. If I bought a new one and it didn't focus I'd send it back under warranty.
Posted by wvbarnes on 13/02/2014 - 23:34
AF Adjustment
You can calibrate a zoom to an extent. Calibrate it for an average focal length / focus distance. Some lens / camera combinations can be so far out that they will not focus accurately at any focal length or focus distance. Ask AndrewA about the situation with his K-5 and all of his lenses, primes...
Posted by davidstorm on 13/02/2014 - 23:40
AF Adjustment
A couple of years ago I calibrated the 55-300 David. Spent about 45 mins doing it. I was happy with the adjustment made on the day. Come the weekend I wasn't happy, so did it again and ended back at zero. Haven't done any since :wink:
Posted by Blythman on 13/02/2014 - 23:46
AF Adjustment
We seem to cover this every now and again. I haven't ever found a lens that didn't focus where it was supposed to. Even the camera instructions caution against calibrating unless it's really necessary. There are so many variables, including length of focus travel, direction of focus, distance, z...
Posted by johnriley on 13/02/2014 - 23:55
