Newtonian Focusers

5 products

5 products
CNC-Machined in the USA

Newtonian Crayford Focusers

Replace your stock focuser with a true zero-backlash Crayford.

A precision Event Horizon Crayford focuser replaces the stock focuser on your Newtonian or Dobsonian entirely — eliminating the backlash and image shift that make fine focus a fight. The friction-drive Crayford mechanism moves the drawtube the instant you turn the knob, so you can nail critical focus for high-power visual observing and long-exposure astrophotography. Drawtube length is configurable at the time of order to suit your tube.

0Image Shift
0Backlash
8 lbLoad Capacity
USAMade & Tested

Configurable Drawtube

Choose your drawtube length at order time to match your optical tube and reach focus cleanly.

Manual or Motor-Ready

Dual-speed EV1, single-speed EV2/EV3, or EVRZ/EVRP built to accept your own ZWO EAF or Pegasus motor.

Built One at a Time

Each focuser is CNC-machined, individually assembled and tested in our USA facility before it ships.

Have a Schmidt-Cassegrain instead? See our SCT Focusers. New to Crayford focusers? Read the full Event Horizon Focusers guide.
JMI Event Horizon EVRZ ZWO focuser with Newtonian adaptation, view 1
JMI Event Horizon EVRZ ZWO focuser with Newtonian adaptation, view 2
Event Horizon ZWO EAF Robotic Telescope Focuser - EVRZ - ASCOM- Newtonian Adaption
JMI Event Horizon Pegasus FocusCube3 Robotic Telescope Focuser EVRP ASCOM Newtonian Adaptation product photograph
1.25-inch T-thread adapter component
Event Horizon Pegasus FocusCube3 Robotic Telescope Focuser - EVRP - ASCOM- Newtonian Adaption
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 EV1-N Dual-Speed Event Horizon Telescope Focuser - Newtonian
JMI EV2-N Event Horizon telescope focuser for Newtonian, view 1 of 7
JMI EV2-N Event Horizon telescope focuser for Newtonian, view 2 of 7
JMI EV2-N Event Horizon Telescope Focuser - Newtonian
JMI EV3-N Standard Event Horizon telescope focuser for Newtonian, view 1 of 4
JMI EV3-N Standard Event Horizon telescope focuser for Newtonian, view 2 of 4
JMI EV3-N Standard Event Horizon Telescope Focuser - Newtonian