Al

Comment on the Weather

Go ahead…  make my day.  Tell me how good or bad your weather is.  Lemme tell ya’, this PNW weather is dragging me down. I’ll start,  It’s Nov 28.  The last chance I had  to do some astrophotography (actually just good enough to do some mount testing) was on the 13th, the time before that …

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Batteries

Going remote with your Astrophotography Rig? You’ll need power….  Quite a bit of it.  Most people won’t want to have a generator ruining the peaceful solitude of the night, so battery power is the usual solution. So how much power do you need, what kind of batteries will do, how to connect to them, how …

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PE Measurement

Oh geeze….   PE.   Now this is a horrid subject.  Here’s an introductory guide. This discussion will refer to errors in the drive systems of  German Equatorial Mounts (GEMs) and particularly to those that are driven by a worm gear arrangement.  The basics and principles will of course also apply to other drive systems, …

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