Celestron MD-4 Dual Axis Motor Drive with Hand Control for CG-4 Mounts and Advanced C4 R, C6 N (with CG-4 mount).

Celestron MD-4: Picture 1 thumbnail Celestron MD-4: Picture 2 thumbnail Celestron MD-4: Picture 3 thumbnail Celestron MD-4: Picture 4 thumbnail

List Price: $212.95

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About Celestron MD-4

This dual axis motor drive, with drive corrector capabilities, is designed for Celestron's CG-4 mount. It precisely controls the telescope's tracking speed during long, timed exposures of celestial objects, producing the best possible image sharpness. Precision drive correctors are a must for those with a serious interest in astrophotography or CCD imaging. Four speeds are available-1x (sidereal), 2x for guiding, 4x, and 8x for centering.

These precision, state-of-the-art DC motor drives operate from 4 D-cell batteries (not included). The hand controller module is very compact and fits easily in the palm of your hand. Motors for both axes are included, along with brackets, clutches and hardware.

The Celestron MD-4 is commonly used for Astronomy and more.

Summary of Customer Reviews

Customers most agreed on the following attributes:
Best Uses:
Astronomy (4),Astrophotography (3)
Reviewer Profile:
Casual/ recreational (3)

Celestron MD-4 Reviews

Reviewed by 4 customers


Accurately tracks, electronics exposed


from Miami, FL  -  Professional Guide

Tracking is surprisingly good with very low battery drain (don't use rechargeable batteries though - they don't supply enough voltage). However the circuit boards are exposed to the elements and can be easily damaged or broken off even with careful use. The battery holder is especially cheap in construction with very fragile soldering connections. Despite the accurate tracking, this unit is very overpriced due to poor construction.


Excellent CG-4 tracking


from Massachusetts  -  Casual/ Recreational

Does what it's supposed to, and has a clutch release for DEC adjustments via knob. However, doesn't allow for using RA knob to do any adjustments (requires use of controller).

(4 of 4 customers found this review helpful)


Only game in town for CG4.


from Alamosa, CO  -  Casual/ Recreational

The drive is the real reason for buying a GEM mount. With this drive, things stay put rather than drifting off even as the earth turns; you do have to do at least a rough alignment on Polaris though. The installation instructions were weak as they were on the scope itself but a little fiddling and I got it. You lose the ability to use the slow-motion control for RA but the declination slow motion control can be used via a manual clutch knob. Normally, I make fine adjustments using the control box; however, it is sometimes very slow to start moving. Large adjustments are made by using the mount's two clutch knobs to get it as close as possible. My unit also has a slide switch which is a little twitchy and sometimes requires jiggling to get it to turn on.

(3 of 3 customers found this review helpful)


Works like a charm.


from Tampa, FL  -  Casual/ Recreational

These motors are the best investment I made for my new Omni XLT 150. They make your viewing sessions so pleasing. When sharing the night with others such as friends and family these motors are priceless. Allows me to even use 4m with a 2x barlow (highest magnification I have) and still stays right on taget while everyone takes a peak. Not to mention when viewing at this magnification and trying to use the manual knobs you get some vibration and shakiness. I highly recommened this to anyone buying a cg-4 mount.


Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  I understand there is a kit for an older CG$ model and a newer one. How can I differentiate them? either the drive kit or the CG4.
JOSEPH L M  I would put this question directly to the manufacturer, Celestron. They have a toll-free phone number to call. One of their telescope engineers or customer service specialists will have the latest information, and they can answer your question exactly, so you will have confidence on what to buy. Good luck, and Clear Skies. --Joe / Arizona
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