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I also have a few 2” and 1.25” correct image prisms (WO/Celestron/Meade). I shall try them out on my small ED refractors to see if there is improvement when the weather gets fine.

K W TONG
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C8 + CG-5GT, TSA102 + HEQ5 PRO, MK67 + Voyager Mount, WO ZS 80FD + Mizar K mount, NexStar 6SE, WO Megrez 72 + Kenko Mount, Mini Borg 50, C5, PST

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FWIW, "correct image" prism diagonals (whether 1.25" or 2" size) probably aren't well suited to the task.
At least, for high magnification use. Their refractive properties might offer some improvement over a mirror diagonal, but the Amici roof-angle in their design creates a diffraction effect which distorts the image. I've never seen an Amici-type prism perform as well (from a sharpness standpoint) as a traditional right-angle prism.
They're great for daytime, when the observer is using lower mags and is most interested in a correctly oriented image.

All that said, if you've already got one, it would be interesting to give it a try.


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A few telescopes of dubious value.
Understanding wife, two curious cats and one sadly departed.

"Semper ubi sub ubi"

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