Cost. Of course, it's easier to justify modding a $600 used camera than it is to justify modding a $3,000 camera rendering either virtually unusable before dark. As well, at this point, I would debate instead buying a dedicated astro camera, the ASI533, for example.
Thanks. I bought my D800E used from a friend almost four years ago, modified it and it's still going great. I don't anticipate needing another camera for awhile and then maybe more used D850 cameras will be around. The evolution of astro cameras is interesting. When I was looking at full frame astro-dedicated cameras a couple years ago the latest and greatest from QHY selling about $4K was still using the same sensor Nikon built into the D800/D810 starting in 2012. They have been upgraded now to the back illumination technology and we'll see where they go from there. There are so many variables in producing astroimages including choice of optics, seeing, guiding, light pollution, image processing skills, etc., etc., but given reasonable conditions I can honestly say my full spectrum modified D800E isn't the limiting factor in the quality of my images. It's often hard for me to see qualitative differences between images that roll out of my camera and those taken from a camera costing $3K more.
Edited by AgilityGuy, 04 March 2021 - 03:07 PM.