I have a Pentax K-r and a Metz mecablitz 50 AF-1 digital flash unit, and I've been having problems with red-eye. As a result, I'm considering getting a flash bracket.
I am aware that I can simply buy the bracket itself (and the required cold shoe part or Pentax Off-Camera Shoe Adapter F), and use the pop-up flash as a master or controller in a wireless P-TTL setup. However, I am aware that I will lose aperture, ISO, and focal length communication (required for auto zoom) with the flash as well as high-speed sync and possibly rear-curtain sync. The flash should still be able to sync correctly and the camera should be able to meter properly. (I've done off-camera flash before, but I don't like Strobist.) Under what circumstances would this be acceptable?
I am aware that are certain Pentax accessories that appears to allow P-TTL communication with the camera and enable full functionality. If I get the following accessories:
will I indeed get full P-TTL functionality, with aperture and ISO communication as well as high-speed sync and rear-curtain sync? Will the flash be able to zoom automatically with these parts? If so, is this worth the extra money? How useful is this extra functionality?