Hi,
ahhh, I meant “secondary” as in some sort of corrector not a secondary mirror… Even a “perfect” mirror will exhibit some aberrations at f2. Something to stretch it out to f4 maybe, a barlow lens basically, then the camera. I’ve got boxes of lenses to play with that I’ve accumulated over the years. However I have a small fibre fed Littrow spectroscope I built a while back sitting in a drawer. It needs a bit of tlc but offers interesting possibilities. Ultimately the mirror might just become a flux collector rather than a “telescope”, no need to worry about imaging quality then. The next problem is a suitable mount, it is a chunky piece of glass…
It’s all good fun!
Bill.