Quote:
Originally Posted by Omaroo
Thanks Barry 
Paul - I only went to -5 and no further. At -5 it was already at 54% or thereabouts, so ambient was pretty high. I'm running a little 50w 240-120vAC step-down at the moment, and that little thing gets pretty warm so I don't want to push the cooling cycle too hard just yet. Frames I took either side of the Tarantula look clear, so I don't know what the cloudiness is - extra nebulosity? 
With the shutter closed, how would you know if you were in fact frosting? Take an exposure, shine a light down the scope and take a look? |
I think you will do better than that very soon Chris
enjoy the move to the good side...
I know it would have cost a tad more but did you consider an FLI camera? You would have no trouble going very cold even on warm nights then. The second night I imaged my last bit of the Vela SNR for example the evening temp at session start was still a balmy thongs and t-shirt +25C but my FLI still got down to a -35 chip temp (just), once it cooled a tad more soon after the camera just chugged away all night, like it does all year round, at a frosty -35C
Mike