Originally posted by Cannikin Actually, that sounds exactly like it's firing full power every time.
The flash is not varying its power, so in essence it is just like a fixed light source. The reason why ISO 100 doesn't look as bad is because it's just less sensitive to the max power of the flash, just like any other fixed light source. The actual flash power hasn't changed.
The results we're getting pretty much point towards a poor contact between the camera and flash.
I can't replicate the problem on my K-7, looks like a flash-camera contact issue.
Its either the physical contract point or deeper in the circuitry.
I'd use an eraser on the Hot-Shoe contacts, then just wipe down both the hot-shoe and the flash side.
If you have another Pentax dSLR to test it on, and the flash is OK, then the problem more likely lies in your K-5's circuitry.
You may want to make use of the return policy, or have it checked under warranty.
Sorry about that.... I can understand something breaking down after heavy usage, but I hate it when a brand new piece of equipment doesn't work...
Last edited by kittykat46; 10-26-2010 at 01:06 AM.