JMI Telescopes EV-XT 3" Crayford Focuser for Cassegrain Telescopes

The EV-XT 3" Crayford Focuser from JMI Telescopes is a replacement focusing system for larger Cassegrain telescopes. It is capable of supporting and lifting up to 8 pounds. This is important for astroimaging, astrophotography or when using heavy eyepieces or accessories. The Crayford-style is able to achieve highly precise focusing by its unique metal-on-metal friction system. Since it doesn't rely on tracks and gears, minute adjustments are possible to a degree that rack-and-pinion style focusers are incapable of. The focuser is designed for 10 to 16 inch Cassegrain telescopes with standard output threads.