Image of the day

Captured by
Alexander DiNota

NGC160 Lenticular Galaxy

My Account

New to Astromart?

Register an account...

Need Help?

Telescopes performance decreases as night progresses

Started by Antlerguy, 09/17/2021 08:18PM
Posted 09/17/2021 08:18PM Opening Post
I have been testing all of my scopes. All of them are kept at 74 to 78 degrees.
At night I put them out to cool down. At first images are sharp before cool down. Gradually over 4 to 6 hours it goes very bad.
Here are the tested scopes.
9” apo
11.8” mewlon
Questar 7”
Passive cool down used