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Old 12-07-2019, 12:46 PM
RussellH
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RussellH is offline
 
Join Date: Oct 2005
Location: Sunny Queensland
Posts: 172
Well I’m no expert, but this is my understanding.

First off, a teleconverter is a lens adapter that mounts on the camera, has camera glass type optics, and multiplies it’s focal length. A Barlow is an add on eyepiece for a telescope with a simple lens system that multiplies its focal length. A powermate (brand name, not a term?) is like a Barlow but it has extra optical elements which help overcome some of the optical flaws that’s Barlow’s introduce. I guess it’s almost like a teleconverter for a telescope.

So they’re all slightly different implementations of ways to multiply your focal length.
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