Originally posted by Eruditass so it always fires a pre-flash? is there no manual setting?
why do my shots with a (bad) diffuser come out much darker? shouldn't it compensate or did it reach max discharge
You would think the PTTL would compensate for the diffuser, but I also noticed that it didn't. That's why I was under the impression that the PTTL wasn't utilized with just the onboard flash. However, I checked, and I did see it pre-flash- dunno- maybe it just puts on a good show.... If it comes out too dark, try some + flash compensation manually.
Honestly, I messed with diffusers and adjusting the onboard flash, etc... on both the K2000 and my 'old' Panasonic fz28 PnS camera. Some of the used, hot shoe flashes aren't much more money than some of the diffusers that are sold for the pop-up flash. No, you won't have PTTL for some of the less expensive units, but you can get an 'auto' mode and a manual mode.
Since the k2000 is a small body, I took the size of the flash into consideration as well when I made my choices.
Do some searching on the board before you buy. From what I understand some (not al) of the voltages for certain, older, non-Pentax units aren't safe to use with your DSLR.
If you really want to get into using some effective flash, you are going to want a dedicated, hot shoe unit.