I have been keeping track of this for months.
I primarily look at planets. I have started to develope interests in clusters and double stars.
I keep my scopes in a air conditioned garage. 72 to 78 degrees.
this is about 10 degree warm up when I put them out.
I just leave them sitting a couple hours . Prior to using them I take a few looks during cool down.
it can be quite sharp on good nights and I find myself using them during this temperature equalizing period .
then they start getting progressively worse when the planets are In their best position.
even after 6 hours.
they don’t have cooling fans. Some of my scopes are listed below.
tak. Mewlon 300 crs
TMB 228 mm
i have not tried my rcos 16, unitron 160, Edmund 4” achro, Edmund 4.5 reflector 32” reflector, others.
I was going to start putting fans on them. Blowing don the tube??? On the refractor tube?? I was going to put a screen over the open focuser end and point it up.
just looking for advice from more experienced individuals than me.
thank you for your advice in advance. Stewart