Originally posted by bjdavey If I use the K-5 self timer on 2s delay, or remote on 3s delay, combined with flash, the initial button press sets off the flash (seemingly at full strength), with a second less powerful flash when the actual pic is taken. This has sometimes caused me to lose the picture, as the flash is still charging after the first release when the pic is taken. The same does not happen with a 12s delay on self timer, so it seems to be connected to the mirror-up component of the shorter delays. Can this be prevented?
I believe that the first flash when using 2sec delay is the P-TTL pre-flash and the flash at the end of the 2sec is the flash used to expose the shot.
I have used this in order to use a flash meter to figure out what flash ratios are used in various multi-flash set-ups. Not using the 2sec delay prevents me from separating the pre-flash from the main flash.
I wouldn't expect the pre-flash to be at full output though.
davek