Quote:
Originally Posted by Eric Hahl
The included (as measured) periodic error graph for the GEM 45 shows less than 5 arc seconds and about 6.2 peak to peak...impressive.
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Test that, all of the iOptron PE graphs I've seen end up being WAY optimistic compared to the actual usage. I believe that they even state in very tiny letters that they measure the worm/spur gear alone, in a lab condition. Once you install them on shafts, and add motor drives and timing belts, bearing sag, mount sag, etc they show much worse. A smooth PE that is +/- 50 arcseconds is better than a choppy one that is +/- 10 arcseconds.