Review on 🔭 Celestron AstroMaster Telescope Single Axis R/A Motor Drive by Eric Kim

Very easy to install, only requires the Allen key provided. The instructions make it clear where to attach it. Be sure to remove the appropriate handle (RA) on the telescope or you will damage the flexible aluminum motor mount coupling. Put it on my Celestron PS 127EQ and it tracks Jupiter well (with an 8mm eyepiece i.e. good magnification). First you need to align the telescope mount with Polaris (Polar Star). The speed is controlled by a small knob on the motor unit. For testing, I found it tracked Jupiter for over an hour with little or no adjustment. Please note that the only way to adjust the RA when the motor is connected is to loosen the lock nut ra and then rotate the scope manually. EDIT: I used a little more and found this worked pretty well. As I said, you must first align your telescope mount to Polaris (polar alignment), at my latitude it's a fixed 34 degrees above the horizon. There is a small plastic knob to adjust the speed and the reason is that you only need to adjust the speed ONCE. You basically set the angular velocity at which it tracks an object in the sky, and that velocity (for a given location) is the same for all the stars and planets in the sky. It is best to set the speed at a higher magnification (e.g. 8mm eyepiece) with a bright object such as Jupiter. This requires trial and error, for example by looking at one of Jupiter's moons that is the same distance from the edge of your viewing disk. The next day, when you pull the telescope back out, you will NOT need to adjust the speed again. EDIT 2: It's been three months and I still have to replace the original battery. My estimate at this point is that a single 9v battery will last around 30+ hours of use. Check out the photos I posted to the right to see how well this works! EDIT 3: I've found that the speed inevitably slows down a bit when the battery is low. This means it's time to replace the battery, so keep it handy. In my case, of course, this happened just as I was attempting to take some long exposures of the Andromeda galaxy. EDIT 4: Mine has been running for a year now with no problems. During this time I changed about 3 sets of 9V batteries, with long nights of observation every week or two. From time to time there's a place on a star or planet where that little plastic box gets in the way a bit.