Here are a few images of a simple Q4. It was brought about 40 years ago for optical company I worked at to test a mirror assembly.
The telescope has a 1/10 wave PV as tested on Zygo ( I don't have the report anymore). The scope was scrapped, since the project
was no longer being produced. I use for nature watching and if I need a quick observing scope to take. It's a f/15 (1,500mm) system.
The views are wonderful and sharp. Since the sun is active again and Mars is close, I plan some imaging, (simple, I am not strong processor)
The optics are still clean, the mirror is fine, the corrector is not coated, not an issue. Not a Questar, but it does the job.