JMI ASCOM Compatible MotoFocus Deluxe for C11/C14

Product Overview

The JMI MotoFocus Deluxe for the Celestron C11 and C14 is an electric focus motor paired with a battery-operated hand control. The motor attaches to the shaft of the focuser knob, or to the knob itself, and drives focus at high power without the telescope being touched. This version is built for classic orange or black optical tubes with a 19 mm (0.748″) focus knob inside diameter. The Deluxe generation is ASCOM compatible, and JMI publishes a weight of 1.1 lb for the item.

Who It's For

This is a good match if you run a Celestron C11 or C14 with a 19 mm knob ID and want focus you can drive from a hand controller or from ASCOM-aware capture software rather than by hand at the eyepiece.

Key Features & Design

• ASCOM compatible: Focus can be commanded from astronomy software that supports an ASCOM focuser driver.
• Sized to the C11/C14 knob: Built for a 19 mm (0.748″) focus knob inside diameter on classic orange or black tubes.
• Vibration-free focusing: The motor moves the focuser, so a long-focal-length image is not disturbed by hand contact.
• Variable speed: The hand control offers variable speed for coarse and fine adjustment.
• Electronic braking: Precise positioning is accomplished through electronic braking rather than mechanical drag.
• Published weight: 1.1 lb for the motor and controller.

Mechanical Design

The motor clamps onto the shaft of the existing focus knob, or over the knob itself, so the telescope's own focuser stays intact. The 19 mm (0.748″) knob inside diameter is what sets this version apart from the C8-class unit. Mounting involves no drilling and no tapping of the optical tube, and drive passes through the standard focus shaft, which leaves the original focus travel available if the motor is taken off again.

Recommended Uses

• Planetary and lunar imaging at the long native focal lengths of the C11 and C14, where focus tolerance is tight.
• Deep-sky imaging runs where focus is re-checked as a large corrector plate and tube cool through the night.
• Visual observing at high power on a heavy tube, where hand-focusing shakes the view for several seconds.
• ASCOM-driven sequences that command focus from capture or automation software.

Compatibility and Accessory Notes

JMI lists this version for the Celestron C11, CG-11, CM-1100, Ultima 11, C14 and CG-14. It is specified for classic orange or black optical tubes with a 19 mm (0.748″) focus knob inside diameter, so knob ID is the figure that decides the fit rather than the model badge alone. The C8, C9.25 and RASA 8″ class telescopes take a separate version, as do Meade SCTs, which are split again by round or hexagonal knob. The Deluxe motor pairs with the Deluxe hand unit; it is not backward compatible with earlier MotoFocus or MotoFocus+ hardware, and the two generations are not interchangeable. Tell us your telescope model and we'll confirm the fit.

Good to Know Before You Order

• Knob inside diameter decides the fit. This unit is specified for a 19 mm (0.748″) knob ID on classic orange or black tubes.
• Model-specific fitment. The published list covers the C11, CG-11, CM-1100, Ultima 11, C14 and CG-14; other Celestron tubes are covered by a different MotoFocus Deluxe version.
• Deluxe generation only. The Deluxe motor and the Deluxe hand unit work as a pair; MotoFocus and MotoFocus+ parts belong to the earlier generation.
• Published weight. JMI lists 1.1 lb for this item.

Frequently Asked Questions

Is it difficult to install?

Installation consists of attaching the motor to the focuser knob shaft or over the knob itself. JMI states that mounting is easy and requires no drilling or tapping.

How do I tell whether my knob is the right size?

The specification is a 19 mm (0.748″) inside diameter on the focus knob. Measuring across the inside of the knob gives the answer, and we are glad to check it with you.

Does it work without a computer?

Yes. The battery-operated hand control drives the motor directly, with variable speed for coarse and fine adjustment. ASCOM control through a computer is an additional option rather than a requirement.

Will it fit a C8 or C9.25?

Those telescopes take the RASA 8″ / C8 / C9.25 version, which JMI lists as a separate product.

Bottom Line

In short: a 1.1 lb ASCOM-compatible focus motor and battery hand control for Celestron C11 and C14 tubes with a 19 mm (0.748″) knob ID, giving variable-speed focusing with electronic braking and no drilling at installation.