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JMI

JMI

JMI solves the problems that come after the telescope: how to move a heavy Dobsonian across a lawn without dismantling it, how to transport an optical tube without it arriving out of collimation, and how to motorize a focuser that has no factory option. Their solutions tend to be simple, heavily built and long-lived. David Astro carries JMI products in Canada, held in stock for fast domestic shipping.

Fit is specific to your telescope in most of this catalogue. Tell us the make and model and we will confirm the correct case, wheel set or focuser retrofit.

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What JMI Makes

The catalogue centres on transport, storage and focus retrofits — the practical logistics of owning large equipment.

  • Wheeley Bars: Wheeled platforms that let a fully assembled mount and telescope be rolled out of a garage and into position, which removes the setup barrier that stops large scopes being used.
  • Telescope carrying cases: Hard cases with fitted interiors for specific optical tubes, protecting collimation and coatings in transit.
  • Motorized focuser retrofits: Motor drives for a wide range of stock focusers, adding remote and fine focus control without replacing the drawtube.
  • NGF focusers: Replacement focusers for Newtonians and other telescopes where the stock unit cannot hold an imaging load.
  • Binocular telescopes: Dual-optic instruments for two-eyed viewing at telescope apertures.
  • Accessory cases and organizers: Compartmented protection for eyepieces, filters and small components.

Why Choose David Astro for JMI

Most of these products are model-specific, and ordering the wrong size is an expensive mistake on a large item.

  • Model-matched fitting: We confirm case dimensions and wheel bar compatibility against your specific telescope and mount rather than a nominal category.
  • Transport advice: If a Wheeley Bar is not practical for your ground surface or doorway, we will say so and suggest an alternative rather than shipping something that will not work.
  • Focuser retrofit checks: We verify that a motor kit matches your focuser's shaft and mounting before ordering.
  • Authorized dealer: Genuine JMI products with manufacturer warranty, in stock and shipped from our Canadian warehouse.
  • Domestic shipping: Bulky items ship from Canada with no duties or brokerage fees for Canadian buyers.

JMI in Canada — Frequently Asked Questions

Will a Wheeley Bar work on grass?
On firm level lawn, yes, though larger wheels handle uneven ground considerably better. On soft or sloped ground the wheels sink and the advantage disappears. Tell us your surface and we will advise.
Do I need a hard case for a Dobsonian?
For the optical tube, if it travels by vehicle regularly, yes — the mirror cell and collimation benefit from impact protection. Truss and collapsible designs often travel adequately with padded covers instead.
Can JMI motorize my focuser?
They make retrofits for a wide range of stock focusers across many brands. Send us the telescope model and the focuser type and we will confirm whether a kit exists.
Are these products in Canadian stock?
In-stock items ship from our Canadian warehouse without customs handling, which matters for large cases and platforms where cross-border freight is expensive.

Moving a big telescope?

Tell us your setup and your ground and we will recommend the right transport solution. Canadian stock, no surprise duties.