Sky at Night Magazine - - FIRST LIGHT -

At the front of the In­fin­ity there is a 57mm col­lar which is in­ter­nally T-threaded (M42x0.75). At this di­am­e­ter, the col­lar doesn’t slot into a 2-inch eye­piece holder, but a 1.25-inch eye­piece adap­tor is sup­plied as stan­dard. The back­fo­cus dis­tance (how far the sen­sor is be­hind the col­lar’s lip) is 13mm.

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