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What is the difference between this 'diagonal' and the standard diagonal behind the rear (which is also a 3rd flat mirror) ?
I can imagine that yoy have your eye on the side rather than behind the scope. Not much difference.
By having the diagonal in front of the Primary you move the focal point a lot further out the side. A conventional diagonal at the rear of the OTA will not extend the focal point far enough. This would cause issues when the scope is pointing near vertical, you won't be able to get your head underneath.
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