Relative low light and video capabilities of Nikon Cameras

I need to purchase a Nikon camera for low light video. I am not housing the camera. I need to take videos of a solar eclipse. FX or DX doesn't really matter. I will be taking stills with my d-300 and a 170-500 Sigma lens but want to take video with my 70-300 Sigma lens.

The corona of an eclipse is about as bright as a full moon.

Anybody have expertise out there?

Hi Tom,

If you want the best low light, high iso camera ever made by anybody I'd buy some variant of Sony A7S.

If you care about in camera UHD recording and in body image stabilization, buy this one:

http://www.sony.com/electronics/interchangeable-lens-cameras/ilce-7sm2

and if you don't, buy this one:

http://www.sony.com/electronics/interchangeable-lens-cameras/ilce-7s

and one of these if you want to use your Nikon lenses (you'll set aperture on the adaptor)

http://www.bhphotovideo.com/c/product/1002616-REG/metabones_mb_nfg_e_bm1_nikon_g_mount_lens.html/prm/alsVwDtl