Quote:
Originally Posted by BlakPhoenix
T Harmonic drive PE is very different to worm drives. It's always changing based on the weight and angle th mount is at (based on torque on drive in current orientation), so can not use PEC/PPEC like you can with EQ6, etc. This means the true error is MUCH worse than what you may be used to. Not saying it can't be overcome, but don't compare error bars of harmonic drives to more traditional drives.
The biggest thing with these mounts is you need very fast guiding exposures to keep on top of the PE as it can move quite fast at some parts of the sky so you need good SNR for your guide cam so it can keep on top of it.
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This is very interesting, a rare look into actual user feedback.Pretty damning in IMO. On Testars web site "very low periodic errors (within ±20 arc-seconds) make the AM5 an excellent mount for astrophotography". thats a bit of a stretch
. A very specific use case, the need for very fast guiding exposures. If this had output encoders, and ZWO could actually get these encoders to work reliably with guiding to get PE (or it seems just high non PE errors) down this would become a killer mount.