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Andrew I am actually referring not to the calibration step but the actual pulse duration... As I said I had to crank it up heaps and then got " spiky " guiding graph rather than the nice smooth graph without too much oscillation that one hopes for. Never had to do this before in the 10 years or so I have been using PHD so wondering about what might cause this?all of a sudden,not a new scope or anything
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Narayan, PHD won't always use the maximum pulse length. It is just there to set an upper limit.
I'd suggest you check the balance on the mount. Any slop in the gearing makes for bad guiding. If you keep the RA slightly east heavy and the dec a bit unbalanced you'll keep the worms loaded and it won't flop around.
I gave up trying to do photography with a C8 on my CG5-ASGT and bought a G11.