Hi,
I have a problem with my flash's P-TTL (PENTAX AF540FGZ II) when using the following flash settings:
-flash is attached to the camera (K3) bounced at 60°-75° (bright celling)
-flash zoom set to 13mm with its wide angle panel
-any program mode except in manual of course
-flash mode: P-TTL 0,0EV - Leading Curtain Sync Mode
-short lens focus distance (about 1-2 meters) THIS IS IMPORTANT!
If I take a picture with these settings directly to a white wall or if a composition includes white parts I get very underexposed picture. If I change the lens focus distance to about >4 metersor change the flash zoom to >34mm or leave it in auto the flash starts working normally. It has been tested with DA35 and DA50. At DA50 the flash zoom must be set to >48mm or auto.
If I take the flash off the camera and put it in wireless mode near the body with the same settings I have no problems.
It also works normally if a composition doesn't include white parts (not too much).
I don't know if the problem is in the flash or camera. The firmware version is 1.21
Do you have any similar experiences with Pentax flashes?
Thank you.
Last edited by zan; 10-07-2015 at 10:14 AM.