Re: How important is THUM? #APCC

Joseph Beyer

I've looked at purchasing a THUM for a year or so since I started using APCC-Pro and creating a model each time I set up.  I just added in the step of manually entering the temperature and pressure from a small weather station in my yard each time I start up the system.  I routinely shoot 3-4 minute unguided subs with my Mach1/FSQ106 and have no problem getting pinpoint stars.  Unfortunately the local skies don't permit longer exposures but I've pushed it to 5 minutes on particularly good nights with the same result.  The local temperatures rarely change more than 5 degrees - at my station - during imaging sessions.  Some nights that's more than enough to change the sky above me from visibly clear to completely overcast in a matter of minutes.  Another potential source for temperature and pressure is WeatherUnderground that publishes private local weather stations on the web.  They seem to be all over the place.

Join to automatically receive all group messages.