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2" Williams 90 Deg Errecting Prism Diagonal.....189GBP

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I'm considering buying a 2" Williams 90 Deg Errecting Prism Diagonal...

has anyone got any information about the % of light transmitted through

it....I have a meade 2" UHTC Diagonal and would like the the benefit of

no left right reversals.....has anyone got any thoughts....or....experience of

this diagonal



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The purist will say 'don't do it'!

However, I once used a spotting scope that had been adapted to take astro eyepieces. Seeing everything right-way-around was great; really liked it.

If you are not struggling for aperture and don't mind the cost ... go for it :D

Now, where did I put that flame-proof suit :violent3:

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I just brought the Telescope House revelation 90 degree diagonal. 99% Reflectivity, dielectric coatings, all brass compression fittings, 1.25" adapater (also with brass compression fittings), anodised aluminum, free delivery. All this for only £64.99. Bargain. (No I dont work for telescope house hehe)

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I just got a very swift email back from

Williams Optics who say that the prism

diagonal has a reflectivity of about 90%

Has anyone any experience of one of these

I understand that the contrast is higher

but there may be slight CA issues.



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