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Jon Isaacs
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Reged: 06/16/04
Loc: San Diego and Boulevard, CA
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Re: Need Advice on Diagonal
[Re: Kraus]
#5412454 - 09/09/12 10:19 PM
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My two inch diagonal uses a first-surface mirror. It looks like the secondary mirror found in newtonian reflectors. I prefer that as prisms soak up light.
Prisms are actually quite good in this regard, better than a standard diagonal. And since they glass with optical coatings rather than a reflective coating, they are durable like an eyepiece. Prism diagonals are best used with slower focal ratios as they can induce some false color fast scopes.
Jon
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