My platform is the Canon 6D, intervalometer, and Sigma Art 35mm f/1.4, Zeiss Distagon ZE 21mm f/2.8, and Samyang (Bower, Rokinon, and other house brands) 14mm f/2.8 *, plus a third-party wired intervalometer, good tripod/head, and still clear dark night. The last is in short supply in Spring / Summer 2015. Skies did clear for the Moon plus Venus set on Saturday, but then clouded up. That was more fun at 560mm, anyway - crescent Venus.
Nikon 810, Pentax 645Z, Sony A7 series may be better for MP#. 6D has good enough high-ISO performance at a low price.
Tamron 15-30mm f/2.8 is getting good reviews in the astro community.
* I understand that Samyang lenses are not consistent on QC. Mine was fine, though. These lenses are popular with astrophotographers because they generally have low coma and they are cheaper and good - no autofocus - don't need it for astro.