ClearSky ST20 Strain Wave Mount Review - ...

ClearSky ST20 Strain Wave Mount Review - AM7 Specs for Half the Price?

Nov 04, 2026
18

I was in the market for a heavier strain wave mount and considered the AM7 but it was really unattractive at $3000, especially knowing that it uses the same motor sizes as the AM5 which seemed a little weird to me.

I was considering the MLAstro One, which is $2500, has a higher payload, and uses a much larger RA motor, but then I ran into ClearSky. They make the Teseek mounts and have recently started to sell products under their own name.

I was a bit skeptical at first but as luck would have it, ClearSky messaged me on Instagram after watching my SAL-33 video asking if I'd like to review one of their mounts. They gave me the option to get either the ST20 or ST25 and I went with the ST20 because I still had to buy the mount (with a small discount) and the ST25 cost a bit too much for me to risk over an Instagram transaction.

I've been using it every chance I got since early August and so far I've been impressed. I wish the seeing conditions in Boston were better beacuse when it's good, the mount guides at <0.4", but mostly does well around 0.6-0.8" which is good enough for home. I am planning to give it another series of tests when it gets colder here because that's when the SAL-33 gave me a TON of issues. I'm expeting the ST20 to be fine though. I just had a bad SAL-33 and I now have PTSD.

If you'd like to order the mount from AliExpress, Here's a link to one of their Authorized Resellers (LittleLight): https://s.click.aliexpress.com/e/_c332ogoT

MaxGeek is another authorized reseller but they seem to charge a bit more for the product and for shipping so I'm linking to the cheaper version.

Get more info from the ClearSky Website: https://www.clearskymount.com/

If you have any questions, please feel free to ask!

Remember to check out the other post about my 2027 calendar and a BMAC discount. Clear skies!

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