Make sure it's firmly seated in the flash shoe. Make sure the locking pin is still intact. Make sure the slider siwtch that gives you high speed synch and trailing shutter synch is in the far left position. Try a new set of batteries. If one of your set has begun to fail, it will cause havoc.
That's all I can think of at the moment. My 540 outperformed my Sigma Super by a wide margin with far better exposure accuracy. If you continue to have trouble, send it in for repair. -------------- Original message ---------------------- From: Charles Robinson <[EMAIL PROTECTED]> > I've started having wild overexposure problems with my AF540FGz and > K10D. > > At first I figured it was dirty contacts - cleaned everything. > > Then I thought low batteries - charged them. > > Same problem. > > It seems to works almost flawlessly in the "A" exposure mode. But not > in P-TTL. > > The Sigma EF-500 DG Super works like a charm on the same camera in > just about any mode - with a few exposure problems no different from > what I've had when using the past 3 years on my ist-DS. > > Then I figured out what the problem is (but not how to fix it): I'm > not getting much of a pre-flash. Sometimes the flash doesn't go of AT > ALL but I get a teeny-tiny little blip of light out of the flash. > Basically.. the pre-flash is so pathetically non-flashlike that the > K10D or whatever it's attached to go "oh, I didn't get much light > reflected back, I'd better crank up the output!" and the 540 is going > for it for all it is worth. > > So WTF? What the hell would cause it to pre-flash so low as to be non- > existent? And is there anything I can try...... short of sending it > in for service along with the 16-50 I just sent in today? > > I'm so frustrated and sad at the same time. Oh - and angry! Any > suggestions would be greatly appreciated. > > -Charles > > -- > Charles Robinson - [EMAIL PROTECTED] > Minneapolis, MN > http://charles.robinsontwins.org > > I am riding in the MS-TRAM this summer. Please consider sponsoring me! > http://charles.robinsontwins.org/mstram.htm > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
