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Stephen technically yes, but not visibly. Vignetting has to be pretty bad - like 50% - before it’s noticeable.
Steffen you’re right - contrast/scatter may be better with a prism.
But better still is no diagonal. Back in the days when used the Oddie at Stromlo there was an “observers chair” - more like a leather banana-bed - you could lie on it to get right under the big refractor and look up directly without a diagonal.
I’m think of trying same with a Steinheil monocentric eyepiece, having found a source.
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