Originally posted by Medex I had similar behavior of K-1 with rare dark frames (or mirror not going up in Live View one or two times but with first curtain open - really strange picture on the rear LCD) before the shutter charge motor died... First curtain did not open at the beginning, but after removal of battery during the long shot in Bulb/M mode and inserting it back camera got responsiveness again.
Later I noticed some uneven sound during longer bursts (one frame dropped out - black), and then one day shutter stucked on second curtain forever.
I hope your problem is not that bad, because repair of shutter charge motor costs about 450 euros.
Interesting re LV. I've not used LV much (I use tethered or OVF mostly), until recently when I've come over all manual and have been using LV to focus. So focus in LV then swap back to non-LV for MUP/remote & to preserve battery. So more battery consumption than I'm used to by doing it this way.
---------- Post added 05-06-21 at 03:01 PM ----------
Originally posted by jslifoaw My earliest Pentax battery is from 2011 and it seems to function ok in my K-1 and other bodies using the same battery. Do you have another compatible body to test it in? And it sounds like your newer batteries don't exhibit the issue?
Might have just been a one off.
I have another body. Guess I'll mark the battery. Take a spare and monitor it.
---------- Post added 05-06-21 at 03:06 PM ----------
Originally posted by AstroDave I doubt the battery's age has much to do with it.
I am about to report on a series of battery measurements (draft report is ready, I just need to get a few graphs in presentable shape), including a 2011 D-LI90, and it performs just as well as its newer (2013 and 2016) siblings. I rotate all of these, too, through my K-3 and K-1.
Will be interesting to see the results. As I've said above I'm focussing in LV then switching back to non-LV to MUP to take shot. Then I often bracket and take another one or two. Maybe there's a current surge that's required to handle these operations that an older battery may struggle with. Happy to believe anything as this could just be one of those isolated incidents that happens with tech.