Can anyone tell me how to adjust the camera so that pictures taken with an external flash do not appear overexposed? I can't find any information on the Pentax website and the store in which I bought it closed.

1. If the flash is adjustable reduce it's output. 2. If the camera is capable of having the aperture being set manually use an aperture compatible with the output of the flash. 3. Use a neutral density filter. If you are using the external flash as a slave to the internal one and the camera does not have manual settings, your choices may be limited.

Wizard Freds suggestion will not work with TTL metering. It'll just self adjust for the ND filter, aperture setting, etc. You need to use the FEC feature (Flash Exposure Compensation), or set manual outputs. 754 3700+ @ 255x10 HTx4 ASUS K8Ne Deluxe 2GB PQI DDR3200 / 6600GT Ultra 500w x-connect PSU Powerbok G4 1.67 1GB DDR 100GB 7200rpm / 9700 vid AMD64 3400+/768MB/5700VE 1 Toshiba & a Dell

If the camera has TTL metering then the external flash's output has to be reduced. You can put a ND filter over the flash if it doesn't have variable power. If what you are getting is hot spots, maybe an umbrella, bounce lighting, or a difuser would help. Moving the external flash farther from the subject will always work.

"If the camera has TTL metering then the external flash's output has to be reduced. You can put a ND filter over the flash if it doesn't have variable power." Again, wizard, that isn't the case. The meter measures the flash output, and shuts it down at a predetermined exposure. Putting ND over the flash will only cause the output to raise to meet the same predetermined levels. Your way works on a NON TTL flash only if it's dumping at a manually set power. FEC (flash exposure compensation) is what will do the job. 754 3700+ @ 255x10 HTx4 ASUS K8Ne Deluxe 2GB PQI DDR3200 / 6600GT Ultra 500w x-connect PSU Powerbok G4 1.67 1GB DDR 100GB 7200rpm / 9700 vid AMD64 3400+/768MB/5700VE 1 Toshiba & a Dell