TEST 1
Late February. Snows have been melting for several days. Heavy humidity and poor transparency. Seeing poor. Light pollution (population 500 000). Nearly full Moon.
Nevertheless, I couldn't resist trying my new kit. So I aimed at M42.
First, the diagonal tests. Sky-Watcher 2" stock against Baader 2" BBHS Sitall mirror. Under these conditions, I did not perceive any gain in limiting visual magnitude. However, there was an obvious difference in star appearance. To me it was significant. I cannot say whether it's astigmatism or scattering, but I made a rough recreation in Photoshop