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Vixen prism diagonal any good?

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That depends.

If the body of the prism diagonal is plastic (it looks like it is), al all-aluminum body would be an upgrade.  You could use larger and/or heavier eyepieces more safely.

If your scope is shorter than f/8, a mirror diagonal would result in less chromatic aberration on the Moon and planets than a prism.

If either of those two circumstances is true, then a change might be an upgrade.

Optically, though, in terms of brightness of image or image accuracy, it might be a wash.

A dielectric-coated diagonal would also be equally durable in the long run.


That assumes you have 3 or 4 eyepieces to cover a decent magnification range with the scope.  That would come first, before a new diagonal.


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