I currently use the Contax TLA280 which works well on both the Contax G1 and G2 and also use a Contax TTL cord for off camera. I will probably get alot of flack for this, but here goes. I use only Nikon Flash units on my Nikon Cameras, only Contax Flashes on my Contax Cameras and Nikon Flash on my Voigtlanders. The Rollei 35s, I use a, you guessed it, a Rollei Flash. I have never have had a problem with camera electronics by doing this.The results are great.