JMI ASCOM Compatible MotoFocus Deluxe for Meade SCTs with Round Knob

Product Overview

The JMI MotoFocus Deluxe is a battery-operated hand control paired with an electric focus motor that attaches to the shaft of a Meade SCT focus knob — or to the knob itself — on telescopes that use the round knob. Focusing then happens at the hand control rather than at the rear cell, which takes the observer’s hand off the telescope at exactly the moment the image is most sensitive to it. Speed is variable for coarse and fine work, positioning is held by electronic braking, and this Deluxe generation is ASCOM compatible. The unit weighs 1.1 lb and mounts with no drilling and no tapping.

Who It’s For

This is a good match if you…

• own a Meade Schmidt-Cassegrain with a round focus knob and work at high magnification on the Moon, planets or double stars
• find the image shaking for several seconds each time a hand touches the focus knob
• image through an SCT and want focus driven from software over ASCOM
• want a motor fitted without modifying the rear cell — no holes drilled, nothing tapped
• are building toward a Deluxe hand unit and Deluxe motor pairing rather than extending an older MotoFocus

Key Features & Design

• Vibration-free focusing: the motor turns the knob, so nothing transmits hand pressure into the optical tube during a focus adjustment.
• Variable speed: one control covers a fast slew to approximate focus and a slow crawl for the final adjustment.
• Electronic braking: the drive stops where it is commanded rather than coasting, which is what makes small increments repeatable.
• ASCOM compatible: this Deluxe generation presents to ASCOM-aware astronomy software.
• Battery-operated hand control: the system runs from its own hand unit and does not need a power distribution box at the scope.
• No drilling, no tapping: the motor attaches to the existing knob or its shaft, leaving the rear cell unmodified.
• 1.1 lb: light enough to leave attached without rebalancing the tube on the fork or dovetail.

Mechanical Design

An SCT focuses by moving the primary mirror along a central baffle tube, and the focus knob drives that movement through a fine-pitch screw. Two things follow from that arrangement. The first is that the knob sits at the rear cell, where a hand resting on it couples directly into the tube and starts the image ringing — at 300× that settling time is a real part of the observing session. Driving the knob with a motor removes the hand from the equation entirely. The second is that the mirror travel per turn is small, so the useful range of focus commands is short and fine, which is why variable speed matters: a single fixed rate is either too slow to reach approximate focus or too fast to settle on it. Electronic braking is the other half of that story. A motor allowed to coast past the commanded stop leaves the mirror somewhere slightly past where the observer released the button, and the error is not repeatable between attempts. Braking the drive electronically ends the movement at the command, which is what lets a fine adjustment be made in consistent increments and what lets an ASCOM client trust a step count.

Recommended Uses

• High-magnification lunar and planetary observing, where settling time after a touch dominates the session
• Double-star work that depends on holding precise focus across a long observation
• Prime-focus and eyepiece-projection imaging through an SCT
• Focus commanded from ASCOM-aware capture software during an imaging run
• Public outreach, where the scope stays in focus without repeated hands at the rear cell

Compatibility and Accessory Notes

This version is cut for Meade Schmidt-Cassegrain telescopes that use the round focus knob. Meade SCTs with a hexagonal knob take a different MotoFocus Deluxe variant, and Celestron SCTs — C8, C9.25, C11, C14 and the RASA 8″ — have their own versions in the same family. The critical system note is generational rather than optical: the Deluxe motor and the Deluxe hand unit work together as a pair, and they are not backward compatible with the older MotoFocus or MotoFocus+ units, so an existing older hand control will not drive this motor. On the software side the unit is ASCOM compatible, which is how capture and automation packages address it. If you are unsure which knob your telescope has or which generation your existing hand unit belongs to, send us the telescope model and a photo of the focus knob and we will check it for you.

Good to Know Before You Order

• The round-knob and hexagonal-knob versions are different products. This one is the round-knob variant for Meade SCTs.
• The Deluxe motor and Deluxe hand unit are a matched pair. They are not backward compatible with MotoFocus or MotoFocus+, so both Deluxe parts are needed for the system to operate.
• The hand control is battery operated. Power comes from the hand unit rather than from the mount or an external supply.
• Installation leaves the telescope unmodified. The motor attaches to the knob or its shaft with no drilling and no tapping.
• Shipping weight is 1.1 lb. It arrives in a small carton, so combining it with other items keeps freight sensible.

Frequently Asked Questions

Is it difficult to install?

No. The motor attaches to the shaft of the existing focus knob, or to the knob itself, and the telescope is left unmodified — there is no drilling and no tapping involved.

Will it work with my older MotoFocus hand unit?

No. The Deluxe motor and the Deluxe hand unit operate as a pair and are not backward compatible with the earlier MotoFocus or MotoFocus+ generation, so both Deluxe components are needed.

How does it help at high magnification?

Focusing happens at the hand control instead of at the rear cell, so no hand touches the telescope while the adjustment is made. The image is not shaking at the moment the focus is being judged.

Does it work with astronomy software?

Yes. This Deluxe generation is ASCOM compatible, so ASCOM-aware capture and automation packages can command focus.

Can focus be moved quickly and slowly?

Yes. The hand control offers variable speed, covering both a coarse move toward approximate focus and a fine crawl for the final adjustment.

Does it fit a Celestron SCT?

Not this version. This is the Meade round-knob variant. Celestron C8, C9.25, C11, C14 and RASA 8″ telescopes are served by the corresponding MotoFocus Deluxe versions in the same family, and we can point you at the right one for your scope.

Bottom Line

In short: a 1.1 lb ASCOM-compatible focus motor and battery-powered hand control that turns the round focus knob of a Meade SCT, with variable speed and electronic braking, fitted without drilling or tapping and paired with the Deluxe hand unit.