365Astronomy 1.25" Rotating Helical Focuser with Male T-thread Connection
Rotating Helical Focuser with Male T-thread, 1.25" eyepiece holder with two thumbscrews and 29mm focus travel
Please note, the attached accessory (i.e. eyepiece or camera) will rotate when you turn the focusing as it is a rotating helical focuser. On the other hand it has got a much longer focus travel than the more expensive helical micro focusers...
About two rotations will make the full 29mm focus travel. This means that appr. 1mm sideway rotational movement equals to appr. 0.1mm focus travel, which is good enough for most applications.
Features of the Rotating Helical Focuser
2 x metal thumbscrews to hold the eyepiece
3 x plastic thumbscrews to secure focusing position
1.25" eyepiece holder barrel at top end to accept 1.25" eyepiece or other accessory
Extremely light: 126g
Optical length: 47 - 76mm (appr. 29mm focus travel)
Telescope side thread is M42x0.75 (T-thread)
Internal diameter at telescope side: 32.6mm