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Condition: This is an MD-CG5 motor drive handset. It is an old one, probably at least 15-20 years old. It is in very good condition, but we do not have a mount we can test it out on.
This came from the Denver Museum of Nature and Science, so we assume it's working, but can't guarantee that. Thus, the very low price. On the other hand, there are no returns on this item.
The MDCG-5 Drive Controller is designed to be used with the CG-5 Equatorial Mount. In addition to tracking the stars as they move across the sky, this accessory allows you to make small adjustments to the Right Ascension (R.A.) axis from a hand controller so you don't have to physically touch the telescope. This is very important in long exposure prime focus astrophotography where an inadvertent bump could ruin a picture. This motor drive is used for tracking the stars and photographic guiding only—there is no slewing function.