Quote:
Originally Posted by ericwbenson
Actually the integration time for the guider does not affect how fast the correction is applied. The "guide speed" of the mount is what determines the motor velocity, the angular distance is controlled by the length of the correction. So many small corrections can be better than fewer large ones.
When I had the PME under the 20" the guiding was ok, if not exceptional, if the wind was still. But too much breeze (even with a dome) would push the scope and stretch/sqeeze the mount components resulting in bad guiding. And worse often I think it would oscillate in RA, which is more cantilevered than DEC (7 x 20lbs counterweights on the extended shaft will do that !!!) So the PME is a great mount, but not impervious to aperture fever.
Best,
EB
|
You're quite right to remind me of the guide speed - something I hadn't adjusted yet - thanks. Yes, I know the guide period has no effect on on guide speed - the theory was that if the mount is oscillating in RA then it will spend less time oscillating with a lower guide frequency. As it happens I've reduced, but not eliminated the elongation, so guide rate might be the clincher. Once I've got everything right I'll do a large model and activate protrack as well.