Ric when you are just doing visuals and stuff like that the mount is in siderial mode and that is fine for that sort of viewing, as the object will stay in the FOV for ever if you are polar aligned.
However if i want to do some imaging with auto guiding in PHD,it is best to put the mount into photo mode, which gives you better tracking conditions for imaging.
In normal tracking mode PHD would be chasing the guide star all over the place unless you are pretty well spot on with alignment, and it is quite possible to lose it altogether.
I forgot to do this and left the mount in normal tracking mode, fired up PHD and started guiding in this mode instead of Photo Mode, however it ended up guiding pretty well, so i expect my alignment is nearly close to correct.
Anyway it didn't seem to effect the imaging run to much.
Leon
