Astromania 1.25" Double Helical Focuser 0.05mm scale
1.25 inch double helical focuser with 0.05mm accuracy for guider/finder scopes. Fixed orientation preserves field of view during focusing, and compatible with M42/M31 threading adapters. Customer insight notes functional usefulness but mixed build quality and occasional fit issues
Highlights
- 0.05mm precision
- 1.25 inch interface
- fixed orientation for guide cameras
Pros
- 0.05mm focusing accuracy
- Fixed orientation to preserve FOV during focus
- 1.25 inch interface with compatible threads
- Metal construction
- Supports guider/finder scope setups
Cons
- Mixed feedback on build quality
- Some reports of fragile screw nuts
- Size may prevent longer eyepieces from fitting
Best For
Features
- Fixed orientation guider/finder interface prevents rotation during focusing
- Includes M42x0.75 to M42x0.75 adapter; requires R and P focuser with M42x0.75 male thread
- Solid metal construction; one side has M31x0.5 male thread and other side includes M42x0.75 male T-thread collar
- 1.25 inch interface with M42x0.75 male thread and adapters for M31x0.5 or M42x0.75 sides
- Focusing accuracy 0.05 mm with 10 mm stroke; length ranges 46–56 mm
