For your interest, just what you can't use, unless you have your own national observatory ????
A GIANT Monochrome sensor (camera actually, but you could hack it
or maybe it's available as a digital back) , by LARGESENSE. It has 75µm sized pixels, is 12 megapixels and 9 inches x 11 inches. Forget the view camera attached up front and hack it. Easy to do as it's only US$106K
. And you can all handle that sort of size image circle right?
Here are some details.....
http://largesense.com/products/8x10-...al-back-ls911/
also....
https://www.dpreview.com/news/984647...ra-for-106-000
There is also a much smaller 4x5 in the works.
Best
JA