I've just found this on CN, which suggests I should be thinking about getting a prism diagonal (my scope is f15):
If you notice, every manufacturer of quality scopes with fast focal ratios uses mirror diagonals. Every manufacturer that sells quality scopes with long focal ratios sells prism diagonals. It’s not an accident. You get the diagonal that matches the scope.
Nick, I noticed the diagonal you linked to is a prism. Could you tell me why you chose this and not a dialectric?
Last edited by morls; 03-08-2018 at 11:03 PM.
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