Lukman,
Well it just so happens that I've been paying close attention to cool down times for my new FS128 (air spaced doublet). Here it is:
70°-31° about 40 minutes
70°-42° about 28 minutes
70°-51° about 20 minutes
Times and temps are approximate with the temps being taken at the end of the cool down period. Also, I didn't measure the beginning temp. 70° is the temp setting of my house's thermostat. So this isn't scientific, but close enough for your purposes, I believe.
BTW--When I set up for observing, I take the OTA out first and open the case. By the time I set up the mount, polar align and align my Temma controller, the scope is well on its way to being cooled. A smaller APO's faster cooldown is an advantage when using an alt az mount or wheeley bars (e.g., rolling an eq mount out of a heated garage). However, if you have to set up from scratch and especially if you are imaging, the advantage disappears. I am speaking from experience on this one.
Hot dog! The skies are clear. Looks like I'll get to add another data point this evening!
Randy
Well it just so happens that I've been paying close attention to cool down times for my new FS128 (air spaced doublet). Here it is:
70°-31° about 40 minutes
70°-42° about 28 minutes
70°-51° about 20 minutes
Times and temps are approximate with the temps being taken at the end of the cool down period. Also, I didn't measure the beginning temp. 70° is the temp setting of my house's thermostat. So this isn't scientific, but close enough for your purposes, I believe.
BTW--When I set up for observing, I take the OTA out first and open the case. By the time I set up the mount, polar align and align my Temma controller, the scope is well on its way to being cooled. A smaller APO's faster cooldown is an advantage when using an alt az mount or wheeley bars (e.g., rolling an eq mount out of a heated garage). However, if you have to set up from scratch and especially if you are imaging, the advantage disappears. I am speaking from experience on this one.
Hot dog! The skies are clear. Looks like I'll get to add another data point this evening!
Randy
Randy Roy
