I have been doing some experiments using 2 flashes and the 'TTL FLASH' of my SF-7 . I was GIVEN a PENTAX AF200T unit by a Camera Club Mate and it has TTL Flash . I put that one into Hot Shoe of SF-7 and used a small Sunpak auto 170 ( also GIVEN by Same Camera Club member) with a Slave cell' attached as main flash coming in at an angle. FILM was Old Fuji Press 800 which I use for 'Experiments' and have to rate it now at 100 ASA ! I Home-Processed in C41 and scanned with PlusTek OpticFilm 8200I + Vuescan Pro + FastStone Image Viewer to correct colour and sharpen . I also have used a METZ 45 CL-3 with PENTAX SCA Module