I have noticed the F4/5 aplanatic coma corrector selling on Ali Express for AU$180 or so. It does look identical to the one offered but SKyWatcher for 3x that.
https://www.aliexpress.com/item/1005...hoCrlMQAvD_BwE
I'm looking to replace an early model Baader MPCC and am wondering whether the AliExpress item is worth the money.
Anyone??