What does anyone think about using a 500/79 (500-mm f/6.3) catadioptric mirror lens on a Canon APS-C camera to record the November 2019 Mercury transit with?
79 mm (minus the central obstruction) should be enough aperture to show Mercury as a disc, and the sampling would be decent at 500/79 with a resolution of 6000*4000, and also at 1000/79 with a 2X extender and a lowered resolution of (e.g.) 1920*1080.
Great idea for recording the Mercury transit on a budget without a telescope? Or would be terrible results compared to say an AT60ED (360/60 semiapo refractor)?
Would need a Solar filter of course, and a means to Solar-align the APS-C DSLR camera at 500 mm or 1000 mm.
Edited by Nicole Sharp, 06 August 2019 - 04:09 AM.