Originally posted by djrocks66 Hello all, I just got a new DA* 50-135 for my K5. My purchase of this lens was for taking shots of my daughters Theater Team. I think the lens might be defective. I was aware of the slow focus before I ordered it. Boy is it slow! I wouldn't mind but it is not locking focus all the time. It is very frustrating. I have tried it in all kinds of light conditions and it hunts back and forth and jitters sometimes. Once in a while it locks focus. And it is also front focusing. I had to make a camera fine adjustment of 10 to get a decent focused shot. I am starting to regret this move to Pentax. So far I am not happy with the AWB of the K5 and having to fine tune every lens that I use. Most of my shots are also underexposed so I am constantly adjusting the exposure compensation ( which I know I should anyway ) but it is pretty off. Tried the 35 f2.4 and have problems with the White Balance in low light it is totally off with that lens. Weird, but the kit lens does not have the AWB problem in fact the kit 18-55 WR is the only lens that has performed decent except that it is not that sharp. Sorry for my rant, I am just a little frustrated being that I sold my other Camera already and only have a little more time before I can return the K5. I love the camera build. size and weight, the controls and weather resistance but if I have to work so hard to get decent shots it's not worth it. Is it possible that the K5 is faulty or more likely the 50-135? I
Thanks for listening.
Before you think it's all the lens faults or doing all the micro adjustment, how are you focusing?
The reason I ask is that the red AF indicators on the viewfinder may not be where the camera is truly focusing. Also, the center focus point is really huge...
anything in the ( ) frame will cause it to show focus has been achieved. The consequence for this is that you may be focusing on your daughter's eyes, but the camera is really focused on the guy behind her.
Edited to add:
Here is a recent thread, with links to past threads which go thru all the gory details of what I explained. It is definitely recommended reading for anyone that has been frustrated by the K-5's AF performance.
https://www.pentaxforums.com/forums/pentax-k-5/193291-yet-another-auto-focus-...-my-k-5-a.html