Good morning, many many years ago… a friend of mine set out to better understand the art and practice of combining mirrors, deviatori, diaphragms and everything that happens to the optical beam from when it enters the telescope to when it ends at the focal plane, on eyepieces or films (CCDs did not exist at that time…). He began to calculate (I'm not good at it), I write and draw.
A publication came out that perhaps might interest some project perfectionists:
https://1drv.ms/b/s!AsGc5YS-b9tQi0TIZn2zcN5qL2HR?e=hzB6R2
See a little… enjoy the reading
“mogi” Vicentini