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Starizona M42 Spacer - 5mm
The Starizona M42 Spacer - 5mm provides a fixed 5mm extension for optical trains using standard M42 (T-thread) connections. This simple component features M42 female threads on one side and M42 male threads on the other, allowing it to be inserted between accessories like cameras, filter wheels, and focal reducers to achieve precise back focus distance.
Achieving 5mm of Precise Back Focus
In astrophotography, achieving the exact back focus distance specified by your flattener or reducer is critical for sharp stars across the entire field of view. The Starizona M42 Spacer is a fundamental building block for tuning this distance. This spacer provides a simple, rigid 5mm of extension, helping you close the gap between your existing equipment and the ideal focal plane.
By threading this 5mm spacer into your M42-based imaging train, you can incrementally adjust your spacing to match your corrector's requirements. It is a necessary tool for any imager who needs to fine-tune their setup for optimal optical alignment and image sharpness.
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What is the primary function of the Starizona M42 Spacer - 5mm?
The primary function is to add exactly 5mm of physical length to an M42-threaded optical train. This is used to achieve the precise back focus distance required by optical correctors like field flatteners or focal reducers, ensuring sharp stars from edge to edge in an astrophoto.
If my flattener requires 55mm of back focus and my camera has 50mm, can I use the Starizona M42 Spacer - 5mm to correct this?
Yes, this is the exact scenario where the Starizona M42 Spacer - 5mm is used. It threads between your flattener and camera (or other accessories) to add the missing 5mm of spacing, bringing your total distance to the required 55mm.
How would I use the Starizona M42 Spacer - 5mm with an M42 filter wheel in my imaging train?
You would place the 5mm spacer wherever it's needed to achieve the total required back focus distance. It can be threaded onto the front or back of the filter wheel, or between the filter wheel and the camera, depending on the thread orientation and the spacing calculations for your specific setup.
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| Threads |
M42 Female to M42 Male |
| Length |
5mm |
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