I hacked a 4x5 back onto an old Bausch & Lomb 24" f/6.0 aerial reconnaissance lens and mounted it on my telescope.
I then broke out a sheet of 4x5 Provia 100F with 2005 expiration .. it had been kept in the freezer and so was as good as when it was popular for astrophotography.
Shot this and developed it myself. I *think* it was 2 hour exposure.
Pics of the setup
The business end
And the Burke & James Press camera back that I hacked onto it. Note the light-proofing high tech electrical tape to block stray light between the back of the tube and the holder.