Quote:
Originally Posted by mithrandir
PHD does not care if the guide cam is square. It measures both the X and Y movement as it calibrates the mount.
Having it square does make it easier for you, to because making a RA or Dec adjustment mean the guide image only moves horizontally or vertically.
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It is true that phd or other guide software can correct in both directions at once but if there is inconsistent backlash it will cause more jumpy guiding if there are corrections in both axis with each guide impulse. It also makes it much easier to work out where the tracking errors are with the mount. If you are well polar aligned there should be very little Dec correction needed and what there is should be in 1 direction. The RA corrections should be more even and not prone to backlash problems.