I think Bruce already answered this. Anyway...the flash coverage doesn't really have anything to do with the ttl. If the flash is set at 105 it just means it's throwing out a beam of light that matches the angle that a 105mm lens sees. The 135 sees a narrower angle, but that's ok. As far as flash zooming goes, you just want to be careful not to have your flash set for coverage that is narrower than the lens you're using. If you had the flash set at 105 and you were using a 28mm lens the edges of the frame would be dark.
Ok? None of this has anything to do with the ttl meter. Your 135 will work in ttl mode. tv
