I wrote: > 2) With the F80-200f4.7-5.6 or Tamron: when set to a manual aperture (ie off > 'A') it remains in P-TTL mode and will not allow me to select TTL mode.
Sylwester wrote: > I think AF360 won't allow you to select manually plain TTL mode anyway. With > AF lenses with aperture ring set to position other than A it will show P-TTL > because camera has still information about lens coming from electrical > contacts. Unfortunately it won't know what aperture is set and won't close > it to desired value in Av mode. Try doing it in M mode with green button > light metering. Maybe that would help. Thanks for the answers Sylwester. I tried M mode with green button but I now realise that it is only useful for available light or low speed sync flash photos. Although I agree that the camera won't know what aperture is set when off 'A' - it will close down to that aperture to take a photo and with TTL flash it should expose correctly at any shutter speed below 1/150. In fact the *istD manual states that with lens used in the "off A" position TTL flash is available. I tried it again and now the photos come out exposed correctly (maybe there was a dirty contact on the flash or something when I tried before). I also did some more experimentation and found: 1) With the F-lens off 'A' and the camera set to 'P': The AF360 display shows P-TTL but as there is no 'double flash' I guess it is in ordinary TTL mode (why does the flash display continue to insist that it is in P-TTL mode when it is not?). No matter what aperture I set on the lens the 'info' on the *istD preview screen later claims it was at f4.5 (I don't know how it comes to that conclusion?); and the camera sets the shutter speed to 1/100. 2) With the F-lens off 'A' and the camera set to 'M' (manual): The AF360 display still shows P-TTL but again as there is no 'double flash' I guess it is in ordinary TTL mode. I can set any speed up to 1/150 and the 'info' on the *istD preview screen gives f--- (not a swear word I hope). 3) With an M-lens (but with lens information contacts for matrix metering contacts fitted) and the camera set to 'P': The AF360 display again shows P-TTL despite the fact that as there is no 'double flash' once again I guess it is in ordinary TTL mode. No matter what aperture I set on the lens the 'info' on the *istD preview screen later claims it was at f2.0 (again, very strange that the camera should come to this conclusion); and the camera sets the shutter speed to 1/150 (note that this is different to the speed set for the F-lens). 4) With an M-lens (but with lens information contacts for matrix metering contacts fitted) and the camera set to 'M' (manual): As for (2). Is there anyone who can shed some further light on this flash/camera/lens interaction?
