Originally posted by bpjod I have a pair of Nikon flashes, the SB-24 and SB-26. ...would it be fine to mount these flashes to my new K20D?
SB-24 and SB-26 are great. In fact, SB-24/25/26/28/80/80DX/800/900 are all great.
I've been using an SB-25 with my K10D and Canon G5. No problem.
For Pentax, I do have a Pentax AF540FGZ. For Canon, I have a Canon 420EX.
But if I know I don't need wireless or high speed or trailing curtain flash, I use the SB-25 (I like the Vivitar 283, but its head does not swilvel) with either the K10D or the G5.
Set the flash to Auto mode and the camera to M mode with shutter speed 1/180 sec or slower, match the ISO and the aperture settings on the camera and on the flash, and shoot away....
The locations of the "dedicated data pins" on the SB flash don't match the locations of the data pins on the Pentax hotshoe, so you can use the SB flash as is.
But the locations of the "dedicated data pins" on the SB flash match the locations of the data pins on the Canon hotshoe, so I had to remove the data pins on the SB-25 flash.
Edit to add: If you use a manual lens (e.g. a lens with PK-mount or M42-mount), you can use the Pentax AF540FGZ only in Auto or manual mode, just like you would the SB flash, any way. P-TTL does not work with manual lens.