Search results for 'back focus' - page 1070
DA 17-70 - any tips?
Hello All I have used the DA 17-70 as a better reaching lens and one which has a F4 aperture at all focal lengths. Outdoors it seems to lock onto the subject and focus well. Indoors it is often a challenge to get it to focus and allow the shot to be taken. I'm sure I've read that other membe...
Posted by Rataegeoff on 31/12/2012 - 00:22
DA 17-70 - any tips?
Just tried mine on the K5 and K5II. I've never really had any problems with my 17-70, in fact I bought it after trying someone elses briefly and was impressed with the speed of focus, far quicker than the other SDM lens (16-50, 50-135, 300) I have. On both cameras in a back room with no lights an...
Posted by carmagw on 31/12/2012 - 10:46
DA 17-70 - any tips?
Stand to be corrected here, but I seem to remember reading that AF is quicker if you 'pre-set' the lens to infinity before using AF, as it seems Pentax cameras always rack out to infinity then back to the focus point.
Posted by JohnX on 01/01/2013 - 19:01
DA 17-70 - any tips?
as it seems Pentax cameras always rack out to infinity then back to the focus point. None of my lenses behave in this way, the 55-300mm sometimes hunts if focus fails to lock on, but the others don't. The cameras apply tiny adjustments only if the focus is already close to accurate.
Posted by johnriley on 01/01/2013 - 19:37
DA 17-70 - any tips?
Thanks for the further comments. I'm now wondering why the same lens can be more problematic to some of us and perfectly fine for others. For me its always in situations where there is lowish contrast. I usually have the camera in its P setting and set either shutter or aperture according to ne...
Posted by Rataegeoff on 01/01/2013 - 23:41
DA 17-70 - any tips?
I've had a look at the reviews of the 17-70 on the USA forum and it's the same. Some praising the AF and some saying it won't lock. This is an extract from a comparison test the forum did with two Sigma 17-70 models. "The Pentax lens is a different matter. Sadly, we must report that hunting occ...
Posted by bforbes on 02/01/2013 - 00:03
DA 17-70 - any tips?
I generally use M or Av, generally centre-point focus, AF-S, and a mix of metering biases. I am intrigued by this discussion and will try to encourage mine to misbehave tonight -- while hoping it won't. It certainly hasn't in normal use. I don't recall ever failing to get a shot because the focu...
Posted by CMW on 02/01/2013 - 16:33
DA 17-70 - any tips?
Mine is variable. Sometimes it locks just fine, but at other times it will hunt and hunt. I usually switch to MF then and rely on the green hexagon to indicate focus. It is very frustrating, but I love the lens so much I put up with it's quirks.
Posted by Gwyn on 02/01/2013 - 16:45
DA 17-70 - any tips?
A point worth noting... the inertia on the focus ring is very light and it seems (to me at least) that this played a big part in the focus hunting. Gently resting a finger on the focus ring while autofocusing pretty much resolved the hunting :) (Added to that that I generally use centre focus ...
Posted by MattMatic on 02/01/2013 - 17:04
DA 17-70 - any tips?
Hi All It is challange indeed. I checked again and agree with comments that the issue is most pronounced at 60-70mm zoom. The same shot (always centre focus) works fine at wider zoom settings. Not sure that I fancy focussing wide and zooming in as I feel the danger of going off focus it too ...
Posted by Rataegeoff on 02/01/2013 - 21:58
DA 17-70 - any tips?
A point worth noting... the inertia on the focus ring is very light and it seems (to me at least) that this played a big part in the focus hunting. Gently resting a finger on the focus ring while autofocusing pretty much resolved the hunting :) (Added to that that I generally use centre focus ...
Posted by Smeggypants on 03/01/2013 - 16:26
DA 17-70 - any tips?
Would you credit it mines broken, can't zoom below 35mm. I'll be sure to mention the focusing problem and hope it's better after the repair. It's back and, while I have not been out with it, first impressions are that the focusing has improved. Close focus loads better same with low light and low co...
Posted by bforbes on 31/01/2013 - 16:55
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Last quote I had was around £125 and that was with the new upgraded parts When I compared my 50-135 on an old k110d (screwdrive) to my GX20 focus speed there was very little difference in AF speed. I think the noise of screwdrive creates an impression of speed. Here are some shaky videos I mad...
Posted by cabstar on 02/01/2013 - 14:09
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Last quote I had was around £125 and that was with the new upgraded parts When I compared my 50-135 on an old k110d (screwdrive) to my GX20 focus speed there was very little difference in AF speed. I think the noise of screwdrive creates an impression of speed. Here are some shaky videos I mad...
Posted by Mike-P on 02/01/2013 - 14:17
Regularly use a 28mm? (or 50mm)
I own several old "independent" manual focus 28s.I very much like the focal length for general stuff including landscapes. Anything longer and I'm constantly stepping backwards anything longer is a wonderful luxury! In the bad old days of film, I had a 35mm Ricoh compact with a fixed 40mm lens whic...
Posted by bwlchmawr on 03/01/2013 - 20:05
Regularly use a 28mm? (or 50mm)
I don't use the 28mm as much as I should, especially as I only got it less than 12 months ago. However, when I DO use it I love it. It is a great street lens, and complements my 21mm and 40mm in this regard. One thing I have done for the first time is to use it in the Studio for full length shots (f...
Posted by Offertonhatter on 04/01/2013 - 18:55
DA*60-250mm F4
I use the 50-135, 55-300 and have the 60-250. They all get used. If you know the "colours" of the 50-135 my experience is that you will feel at home with the 60-250. It is an excellent lens as you'll see from the pics above. That said the 55-300 is also a good performer and is lighter so tha...
Posted by Rataegeoff on 05/01/2013 - 00:27
DA*60-250mm F4
I don't have airshow experience but I can imagine the always available focus ring on the 60-250 could be very worthwhile for catching moving aircraft against the sky. Just a thought. Not at all, it would have to be a very slow moving aircraft to focus on it manually. Also with default focusing scre...
Posted by piotro on 05/01/2013 - 11:22
Sigma 18-125 or Tamron 18-200
Welcome back to Pentaxland. Both lenses have a decent reputation - it might depend on matching your normal shooting situations to the strength of the lenses, short end or longer end (where the Tamron could be the only choice).
Posted by smc on 06/01/2013 - 14:03
Sigma 18-125 or Tamron 18-200
Can someone please confirm my understanding of how focus motors work. I understand that the K - 30 has a built in focus motor and is consequently indifferent to whether the lens itself has a motor. When used with a lens that does have a motor, I assume that the electrical contacts on the mount...
Posted by Terry1100 on 10/01/2013 - 20:55
