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Starizona M48 Extension - 5mm
The Starizona M48 Extension adds exactly 5mm of length to any M48-threaded imaging train, providing the critical spacing needed to achieve a precise back focus distance. This single-piece tube features male and female M48 threads for secure integration between your camera and corrector, ensuring your optical components are held at the correct separation for a flat field.
Adding 5mm of Back Focus to Your M48 Imaging Train
Achieving the exact back focus specified by a field flattener or reducer is non-negotiable for sharp, round stars across your entire image frame. This Starizona M48 Extension provides a fixed 5mm of spacing, making it the perfect solution for fine-tuning your imaging train when you are already close to the target distance. The M48 thread format (48x0.75mm) is standard for systems using full-frame sensors or large correctors, and this spacer ensures a rigid, non-flexing connection between components.
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When would I use the Starizona M48 5mm Extension?
This 5mm extension is ideal for making small, final adjustments to your back focus. If your current imaging train's length is just short of the distance required by your flattener or reducer (e.g., you have 50mm of spacing but need 55mm), this piece is used to close that small gap precisely.
My reducer requires 55mm of back focus, but my camera and accessories add up to 49mm. Will the Starizona M48 5mm Extension fix this?
No. In this scenario, you need an additional 6mm of spacing (55mm - 49mm = 6mm). Adding this 5mm extension would leave you 1mm short of the optimal distance. You would need a different combination of spacers to achieve the correct back focus.
How do I install the Starizona M48 5mm Extension?
The extension has male M48 threads on one end and female M48 threads on the other. It simply threads in-line with your other M48 components, such as between a filter wheel and an off-axis guider, or between a corrector and your camera's M48 adapter.
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| Thread |
M48 (Male/Female) |
| Length |
5mm |
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Starizona M48 Extension - 5mm
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