I have used this pistol grip for many months (in conjunction with the proper shutter release cable) with my KP. Mainly for macro shots with camera on tripod, sometimes for bird shots (again, camera on tripod) when using the 55-300 PLM lens. A soft press on the pistol grip's trigger has always activated the autofocus, and the shutter has been released with a full press. Had the odd moments when I have accidentally pressed on the Lock button, but have always been able to fix this either by pressing on the Lock button again, or turning the camera off and on.
The probs below are all with modern auto-focus lenses - the 55-300 PLM, the 100mm 2.8 Macro, or the 16-85mm zoom.
Now the pistol grip with shutter release cable has virtually become unusable. Problerms have been:
- a soft press does not activate autofocus
- a hard press does not activate the shutter
- the shutter goes rampant, shooting continuously, even when I am not pressing any camera or pistol grip button.
- A soft press immediately activates the shutter release.
- accidentally touching the Lock button releases the shutter
Sometimes a combination, where a soft press immediately activates the shutter.
I have ensured in the camera menu that the setting for external accessories (mic, or shutter cable) is set to shutter release and not auto or mic.
I mostly suspect that the trigger mechanism inside the pistol grip has become faulty, (maybe the lock mechanism is stuck on Lock) and am about to order a new pistol grip, but does anyone have experience with this problem, or suggestions on whether there may be some obscure menu setting in the camera I may have activated that could provoke these issues? (I do not see any kinks or stress points on the cable).
I hope the electronics in the camera plug haven't gone awry.
Debating if I should fork out the extra cash on the Pentax cable release (4-5 times the price). I have relied heavily on this accessory for most of my macro shots, and occassionally for bird shots.
Comments, suggestions??