When I put a 3x Barlow on my 127x940 I couldn’t see beans for stars. Planetary would be another matter I suppose. Of course you are going to have some darned small fields of view which will test your goto accuracy.
That’s about all I can tell you. I gave it up after one frustrating night. Didn’t try to figure out how to use it properly.
One other thing is the darned things are heavy as can be. Look at those specifications.
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired