rory Posted May 6, 2012 Share Posted May 6, 2012 clear sky at the mo, put the dob out to cool for half hour or so. question... front cover on or off to cool ?sorry , theres going to be a few dumb questions from yours truly over the coming weeks. Link to comment Share on other sites More sharing options...
LukeSkywatcher Posted May 6, 2012 Share Posted May 6, 2012 Take the cover off but point the scope horizontally just incase it decied to start spitting down a bit of rain. 30 mins should be enough for an 8" scope but the longer the better. The expected rain clouds are moving in here from the SW. Link to comment Share on other sites More sharing options...
Mike73 Posted May 6, 2012 Share Posted May 6, 2012 I take mine off and tilt it so it just off horizontal. Link to comment Share on other sites More sharing options...
rory Posted May 6, 2012 Author Share Posted May 6, 2012 Righto cheers chaps. Link to comment Share on other sites More sharing options...
LukeSkywatcher Posted May 6, 2012 Share Posted May 6, 2012 I take mine off and tilt it so it just off horizontal.yeah just below horizontal is better. That rain stuff can come in from all directions except for upwards. Link to comment Share on other sites More sharing options...
umadog Posted May 6, 2012 Share Posted May 6, 2012 I leave mine pointing upwards when cooling. It will cool faster if the mirror can radiate heat into the sky. It's unnerving at first but remember that stuff can fall down the tube just as readily when you there as when you're not.Often, however, I just start observing right away but leave high-power stuff until after it's cooled. Link to comment Share on other sites More sharing options...
LukeSkywatcher Posted May 6, 2012 Share Posted May 6, 2012 Warm air rises................cold air falls. So technically if your scope is a reflector then you should point it upwards to cool so the warm air escapes. So slightly uypwards of horizontal. I said downwards of horizontal so rain if any drops are around dont get on the primary. Link to comment Share on other sites More sharing options...
rory Posted May 7, 2012 Author Share Posted May 7, 2012 ok, next dumb question. long /short tube collimators ? which is suited to my telescope . Link to comment Share on other sites More sharing options...
cs1cjc Posted May 7, 2012 Share Posted May 7, 2012 With an 8", you may be able to start viewing straight away but I would be surprised if the scope is fully cooled for good high power, planetary viewing in less than an hour, particularly if the temperature outside is falling. However different scopes will behave differently and others may have better experience. A fan will help. Link to comment Share on other sites More sharing options...
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