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Just a follow up on this thread. I now have a Williams Optics dielectric diagonal (1/10 wave, 99% refl) for the Helios and tested it against the prism diagonal. The image with the WO 'feels' clearer if that makes any sense, but the resolution, brightness and contrast of fine solar disk features seems the same. Perhaps if I was a more experienced observer I could tell the difference, but I suspect the difference is only incremental. Still, the WO eyepiece lets me focus without having to pull the diagonal out slightly, so that's a plus.
David
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