Originally posted by photogem When you say, "it" goes back to MF: Does this mean the switch itself moves? It that would be the (very rare) case, then the K70 would have been opened (probably for solenoid-repair) and the necessary alignement was then forgotten.
But again, this would only count if the AF/MF switch itself would move, which I daubt.
Can you hear any sound (the screwdrive mechanism makes an obvious sound and won't be there if switched to MF)???
If so, does the sound start and then goes off? If so, more likely a lens problem but could be a gear- or AF-Motorproblem.
That would have been my first question, if what is called the screwdrive-mechanism pokes out of the hole when in AF-position and retreats when in MF-position.
Don't turn/rotate it because it is a geared mechanism and you can damage it doing so!
But check on your DA50 with an appropriated sized flathead-screwdriver if you can turn that part which would be turned by that mechanism.
The best would be to do a check with another lens of course (no Sigma HSM, Pentax SDM or Pentax with an inbuilt DC-Motor though)
because if then the AF won't work then you got cheated for sure.
Hey thank you so much for replying.
The actual button on the body does not switch randomly- just the mode on the camera (think electronic screen). It is like it senses something with targets that are close and thinks the lens is MF. For example, the dog is 10 feet away. I AF on him, shoot a picture. Then, he walks within 3 feet of me, taking up most the frame. I AF on him- and it does AF loudly, but then on the screen the camera says MF and won't AF. Yet(!), the actual button that switches AF/MF has not changed.
Yes the sound (and on the 50 it's loud-ish) of the drive is audible when AF is working. So it's weird, because AF seems to work fine at mild distances and beyond, but once it tries a close object, it AF's, quite hard, and then the camera thinks it's in MF and the lens will not AF. I must manually switch the button to MF, then focus out so to speak, and then I can switch back to AF.
I did turn the little detent mechanism a little to just see if it was loose. From my understanding it is supposed to be in a certain position.
Laslty, if I use a tiny flathead on the lens's slot, what am I looking for?
Thanks!
---------- Post added 10-29-22 at 06:10 AM ----------
Update on the lens screw, I am unsure how easy or not it is supposed to rotate. It does rotate, pretty uniformely. It is hard to tell due to my large hands and this tiny flat head though.
Last edited by nsjohn130; 10-29-2022 at 06:40 AM.