In brief:
- High-quality and precise micro focuser
- SC connection thread for Cassegrain and SC telescopes
- 1:09 fine reduction
The JMI EV-1c Dual-Speed Event Horizon Telescope Focuser is a low-profile, friction-driven focuser designed for both the amateur and professional telescope markets.
The Crayford design applies high pressure to a metal drive shaft that presses against a 2.5-inch focuser tube held by bearings on the opposite side. This direct surface-to-surface drive mechanism eliminates play and shift of the extension tube, allowing for very fine adjustments. This makes this focuser fantastic for visual applications and a must-have for astrophotography with Cassegrain or Schmidt-Cassegrain optics.
Equipped with a 2-inch black anodised aluminium focuser with dual-speed drive, ball bearings, rubberised knobs and two-speed operation. The focuser carries up to 8 pounds and its manual two-speed control has a 1:09 fine reduction ratio. It also includes a compression ring to securely hold telescope eyepieces and accessories without scratching them. The adjustment screw presses against the ring, which tightens the eyepiece or accessory.