JMI EV1-N Dual-Speed Event Horizon telescope focuser for Newtonian, view 1 of 2
JMI EV1-N Dual-Speed Event Horizon telescope focuser for Newtonian, view 2 of 2
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)
JMI EV1-N Dual-Speed Event Horizon telescope focuser for Newtonian, view 1 of 2
JMI EV1-N Dual-Speed Event Horizon telescope focuser for Newtonian, view 2 of 2
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)

JMI EV1-N Dual-Speed Event Horizon Telescope Focuser - Newtonian

SKU: EV-1n
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Configure your focuser

& add discount accessories

select the draw tube length for your focuer

Select which side of the focuser you want the "eyepeice" locking screw on

Choose your rubber grip

Connect your SCT accessories to your new focuser

Use 1.25" diameter eyepeices in your new focuser

Connect your astro camera to your telescope focuser

Connect your Cannon EF DSLR direct to your 2" focuser

Connect your Cannon RF DSLR direct to your 2" focuser

Connect your Nikon DSLR direct to your 2" focuser
CNC-Machined in the USA

Event Horizon EV1 — Dual-Speed Crayford Focuser, Newtonian Base

Our flagship manual focuser. A dual-speed Crayford drive with a 10:1 fine-focus knob for the most precise adjustments possible by hand — replaces the stock focuser on your Newtonian for true zero-backlash, zero-image-shift focus.

A masterpiece of engineering and workmanship, the EV1 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 impossibly fine adjustments. Zero image shift and zero backlash make it superb for both visual use and imaging.

Specifications

  • ✓ Dual-speed drive with 10:1 fine-focus knob
  • ✓ Rubber grip knobs and a compression ring for secure, mar-free holding of eyepieces and cameras
  • ✓ Zero image shift, zero backlash — CNC-machined friction-drive Crayford design
  • ✓ Drawtube length of travel is configurable at the time of order (see drop-down menu)
  • ✓ Compatible with Newtonian telescope tubes 7.25″ in diameter or larger, as well as flat focuser boards
  • ✓ Load capacity 8 lb · focuser weight 1.4 lb
  • ✓ Individually assembled and tested in our own facility — 100% made in the USA
Fitting note: Fitting a new focuser onto an existing Newtonian takes careful consideration and engineering — it is not a one-size-fits-all swap. Many publicly available tools and active community forums can help you plan the change.

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.
  • 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 autofocus? See the motor-ready EVRZ and EVRP versions. Have a Schmidt-Cassegrain instead? See our SCT Focusers.

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