Search results for 'back focus' - page 813
SDM issues? A straw poll.
only one of the Yes's is me. Both units were under warenty and SRS provided their usual fantastic level of support in getting it sorted out. I was only party to it second hand so not completely sure how long it took to get fixed but since we didn't know the camera was broken until the lens came b...
Posted by Mongoose on 28/09/2009 - 15:31
SDM issues? A straw poll.
only one of the Yes's is me. Both units were under warenty and SRS provided their usual fantastic level of support in getting it sorted out. I was only party to it second hand so not completely sure how long it took to get fixed but since we didn't know the camera was broken until the lens came b...
Posted by RichardDay on 28/09/2009 - 16:35
SDM issues? A straw poll.
Hi Richard,Just sent my 50-135 back to SRS.SDM has been ''iffy''for a while and recently completely failed.Hoping for a speedy resolution.:shock: Regards Tony. Thanks Tony, Indeed, let's hope for a quick resolution. I'm sure we will all be interested to hear the result. :wink:
Posted by RichardDay on 28/09/2009 - 16:37
SDM issues? A straw poll.
My 50-135 and a 60-250. 50-135 fell apart inside, and the 60-250 had focusing issues Did you vote No? If so, were either of these SDM failures? Because it doesn't sound like it. I acknowledge that there are other issues, but I'm trying to keep a very narrow focus on the poll so we can identif...
Posted by RichardDay on 28/09/2009 - 21:56
SDM issues? A straw poll.
I voted yes. My first DA*16-50 had sticky SDM from new. It was very reluctant to move but if I used the lens on a camera (K100D) without SDM and wound the focus backward and forwards a few times then the SDM would then work on my K10D for a couple of days before it seized up again. It was replace...
Posted by GlynM on 28/09/2009 - 22:23
SDM issues? A straw poll.
No failures on 16-50, 60-250, 55, 300. 50-135 'iffy'. Sometimes a little sticky when you first use it, but fine after that (and a little squeaky occasionally!) Just wish they were a lot quicker to focus!
Posted by Unlocker on 29/09/2009 - 00:47
SDM issues? A straw poll.
I have the following SDM lenses: DA*16-50 f2.8 DA*60-250 f4 DA*300 f4 DA*55 f1.4 DA17-70 f4 Everyone of them working fine with no problems. The only issue I have ever had with an SDM lens was the DA*16-50 which played up only once. I think it was on the K20D. It refused to focus for som...
Posted by Lance B on 29/09/2009 - 03:39
SDM issues? A straw poll.
My 50-135 and a 60-250. 50-135 fell apart inside, and the 60-250 had focusing issues Did you vote No? If so, were either of these SDM failures? Because it doesn't sound like it. I acknowledge that there are other issues, but I'm trying to keep a very narrow focus on the poll so we can identif...
Posted by loskeran on 29/09/2009 - 12:26
SDM issues? A straw poll.
I have the 16-50 and 50-135. No problem with the 50-135 but I am having occasional problems with the 16-50 not focusing and the AF movement seems very jerky and not smooth and brisk like on the 50-135. It's been back to SRS and Pentax (JPSS) for a repair but no real fault was found - you have t...
Posted by ajbets on 29/09/2009 - 15:08
SDM issues? A straw poll.
I have the 50-135 since 2 months and I voted no. However, on rare occasions the lens has not been able to find focus – the AF never settles and just moves backwards and forwards a small distance. It has only happened 2-3 times and can be fixed by refocussing on something closer and then just try aga...
Posted by FredEriksson on 01/10/2009 - 09:33
SDM issues? A straw poll.
Fred that is an auto focus failure not a SDM one, SDM is simply the motor that drives the focus system of the lens, nothing more nothing less. As for your problem, it's quite normal and it's called haunting. The AF sensor needs contrast to see if the focus is "sharp" or not and it does not like ...
Posted by Anvh on 01/10/2009 - 09:40
SDM issues? A straw poll.
Thanks for your reply, Stefan. I know of haunting, especially when there is not enough light, but what I tried to describe is not that I believe. Basically what happened was that there was scene with lots of daylight and stuff and it should focus with no problems, but it never settled and I could he...
Posted by FredEriksson on 01/10/2009 - 10:04
SDM issues? A straw poll.
the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the problem? I also found that it helps when you manually put the focus nearly correct, it mostly snap on instantly.
Posted by Anvh on 01/10/2009 - 10:07
SDM issues? A straw poll.
The scene was full of contrast and the lens started focusing and the scene was pretty much in focus but the focus never settled. And, the AF mode was NOT AF.C I might add. /F the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the prob...
Posted by FredEriksson on 01/10/2009 - 10:20
SDM issues? A straw poll.
If it stays at this level it's only a very samll nuisance that I can live with. Otherwise the lens is pretty quick to focus with and quiet. And hopefully it will stay that way! :-) /F Very strange Fred, hopefully it isn't much of a problem. :?
Posted by FredEriksson on 01/10/2009 - 10:40
SDM issues? A straw poll.
Lucky Canikon users, judging by all the sdm issues:lol:! Well the Canon mount has a AF micro-motor in the lens but the nikon version does not so the budget cameras of Nikon (D40, D60, D3000) aren't able to auto focus since they don't have a screwdrive in the body. As for the problems with SDM it'...
Posted by Anvh on 01/10/2009 - 14:20
SDM issues? A straw poll.
It might be more than 15% of 16-50 & 50-135 owners though:wink:. Also, might the screw-drive improve the slow focusing that some complain about? Those are simply numbers, probable only Pentax know how many faulty came back for repairs. Although a number of 15% is very high though, when reading th...
Posted by Anvh on 01/10/2009 - 14:55
SDM issues? A straw poll.
I am a long time committed Pentax user who started when Pentax was the out and out "No1" . I have flirted in and out of Canon and Nikon 35mm still having full professional systems alongside a comprehensive Pentax medium format and 35mm system too. However I committed to Pentax digital and went f...
Posted by Daronl on 02/10/2009 - 12:49
SDM issues? A straw poll.
Mr Daly (Pentax Master) :mrgreen:I have commented in the Forum at length and the problem is specific to the DA* 50-135 which I now realize on reflection was shaky from the start I just hope my other 4 SDM's don't follow suit, I have been a committed Pentax user for decades but sadly I think t...
Posted by Daronl on 02/10/2009 - 17:36
SDM issues? A straw poll.
Already sent 50-135 DA* back to Pentax (SDM failure) but discovered a "groaning" sound on my 200 DA* this week. I am wondering if given the failure rate Pentax will charge me for fixing the 50-135. Cars get recalled for this type of high failure rate and are modified / repaired free Anyone ...
Posted by Daronl on 05/10/2009 - 19:42
