Yes, you got it right. I have the 4X Powermate and it works great with the real long FL EPs. I use it with my 30mm and 20mm all the time (50X=200X & 75X=300X), and when the seeing is really good, I can use it with my 14mm (107X=428X). It wouldn't be practical with any EPs with shorter focal lengths.
Name: Sam
Equipment:
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12” Collapsible Dob w/Telrad, Explore Scientific 30mm 82*, and 20mm, 14mm, & 9mm 100* EPs, Tele Vue 4X Powermate & Paracorr T2, 2" Lumicon UHC and ND13 (
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) Filters, 2" Astronomik OIII filter, dew heater system, and Nikon Action 7x50 EX Extreme ATB 6.4* binoculars & Celestron 15x70 binoculars.
I'm enjoying learning the sky by star hopping; just charts, my binoculars, and my Dob!