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I use TV powermates for solar imaging and spectroscopy.
They, as you probably know, have excellent optics and can be used at different back focus with minimal change to the amplification.
I use the 1.25" x2.5 with the T thread adaptor to give f18.75 on the ED80 for close up solar images, and the 2" x4 sometimes on the Genesis f5 to push it to f20.
(Rule of thumb - the imaging focal ratio should be around x4 or x5 the pixel size (in micron) This means with a 5 micron camera using around f20 to f25.
Hope that helps.
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