JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 1 of 4
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 2 of 4
JMI ADPT2-1.25T combination 1.25 inch eyepiece and T-thread adapter (included accessory)
Farpoint FAV100 2 inch focuser to 1.25 inch eyepiece adapter with measurements (included accessory)
Lumicon LA1060 2 inch male to SCT male adapter (included accessory)
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 3 of 4
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 4 of 4
JMI EV3-C Standard Event Horizon Telescope Focuser - Cassegrain
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 1 of 4
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 2 of 4
JMI ADPT2-1.25T combination 1.25 inch eyepiece and T-thread adapter (included accessory)
Farpoint FAV100 2 inch focuser to 1.25 inch eyepiece adapter with measurements (included accessory)
Lumicon LA1060 2 inch male to SCT male adapter (included accessory)
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 3 of 4
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 4 of 4
JMI EV3-C Standard Event Horizon Telescope Focuser - Cassegrain

JMI EV3-C Standard Event Horizon Telescope Focuser - Cassegrain

SKU: EV-3c
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CNC-Machined in the USA

Event Horizon EV3 — Standard Crayford Focuser, Cassegrain Base

The straightforward, no-frills way into true zero-backlash focusing. A single-speed friction-drive Crayford with a compression ring — threads onto the rear of your SCT for smooth, shift-free fine focus.

A masterpiece of engineering and workmanship, the EV3 is a low-profile, friction-drive Crayford focuser for the discriminating astronomer. The Crayford design presses a metal drive shaft directly against a machined metal drawtube held by bearings on the opposing side — a direct surface-to-surface drive that eliminates the backlash and drawtube shift of rack-and-pinion designs and allows very fine adjustments. Zero image shift and zero backlash make it superb for both visual use and imaging.

Specifications

  • ✓ Single-speed friction drive
  • ✓ Compression ring for secure, mar-free holding of eyepieces and cameras
  • ✓ Zero image shift, zero backlash — CNC-machined friction-drive Crayford design
  • ✓ Threads to the standard SCT rear port — fits Cassegrain, R-C, and Maksutov scopes with standard SCT rear threads
  • ✓ 0.565″ (14.3 mm) of fine-focus travel — use the scope's focuser for rough focus, the EV3 for the critical final adjustment
  • ✓ Load capacity 4 lb · focuser weight 1.4 lb
  • ✓ Individually assembled and tested in our own facility — 100% made in the USA

Optional Optical Adapters

  • JMI Combination 1.25″ Eyepiece & T-Thread Adapter (ADPT2-1.25T) — for camera use. Mounts a CCD or other T-threaded camera into a 2″ drawtube, and doubles as a 1.25″ adapter. Uses a compression ring and includes 48 mm filter threads on the focuser end.
  • Lumicon 2″ Male – SCT Male Adapter (LA1060) — to attach SCT-threaded accessories. Presents male SCT threads (2″ × 24 tpi) for accessory attachment such as an SCT diagonal. Includes 2″/48 mm filter threads.
  • Farpoint 2″ Focuser to 1.25″ Eyepiece Adapter (FAV100) — a visual 2″-to-1.25″ eyepiece adapter with a non-marring compression ring. Threaded for both 2″ and 1.25″ filters, with a stop to keep long eyepieces from damaging filters.
New to Crayford focusers? Read the Event Horizon Focusers guide. Want grip knobs and 8 lb capacity? See the EV2. Have a Newtonian instead? See our Newtonian Focusers.

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