Zwo AM5 Harmonic mount drive
Pros
No counterweight required for under 13 kg payload
Mount is around 5.5 kg.
Impressive tracking
No need to balance the DEC axis
Cons
Rely on ASI AIR to work properly
still need a hex key to adjust your altitude pitch angle from 45 to 90 degrees
I have seen a broken azimuth lock-up handle
Polar finder shoe
Price tag
Around 2300 USD when including the tripod, hand controller (estimate BOM cost of the mount is usd 900 or less)
use of synchronous belt is to increase contact area between the stepper gear and strain wave gear, thus increase the energy efficiency(98% typ). At the same time it also eliminate slippage, but transfers vibration too
Ioptron HEM27 Hybrid mount
Pros
IPolar finder included
Mount is around 3.7 kg, lighter than AM5
No counterweight required for under 13.5 kg payload
Similar ( slightly worse) tracking, probably due to slightly larger backlash from DEC stepper belt motor
Cons
Around 2300 USD when including the tripod, hand controller
The alt az wedge is bit spartan for adjustment (need hex key)
hand controller needed always ( someone modified to add WiFi, but needed to connect the HC to the mount), or maybe add an iStarFi WiFi?
Real life photo
The two mounts looked very similar
Overall, the traditional equatorial mount EQ6R-Pro settles a bit quicker, and around US 2,000 complete with tripod and counterweights, hand controller
Fully harmonic strain wave mount, USD 2000, with ipolar
Wido comparison table
trinamic rssing
TMCStepper github
Bulk metallic glass and lifetime of components
HAE43 vs AM5 tweet
After thought :
Can I use a robot arm to just do the same tracking?
when there's strong wind, all such harmonic drive mount will vibrate, and recover slower than those mounts with counterweights.
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