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PrimaLuceLab M48 extensions are available in different lengths and they present on both sides of a M48 thread (one side is male, the other is female). Completely made of metal with black anodizing (both internal and external), these extensions offer an external knurling for a better grip (very useful for example when screwing or unscrewing). Thanks to different M48 extensions and spacers, by ordering different combinations you can adjust the thickness of your personalized extension, in 0.5mm steps!

M48 extension rings have different use:

  1. can be screwed to optical accessories (such as field flatteners or focal reducers) to bring the camera sensor at the right distance from the lens (to optimize performance)
  2. can be used to separate the mechanical accessories that, when used together, can touch and then not work properly (eg an off-axis guider could touch a filter wheel and it could prevent its rotation searching for a guide star)

7mm M48 extension

M48 extensions can be screwed together. In order to set the perfect thickness you need, you can also add the M48 1mm and 0.5mm spacers in between.

7mm M48 extension: specifications
- Thickness: 7mm
- Material: aluminum
- Black anodizing
- M48 male and female thread on sides
- External knurling to improve grip

Thanks to the availability of different extensions and spacers, you can purchase different combinations and adjust the thickness of your customized extension, in 0.5mm steps!
Thickness (mm) Combination Codes
5 5mm M48 extension
 PL3304805
5,5 5mm M48 + M48 spacer 0,5mm
 PL3304805 + PL3304800
6 5mm M48 extension + M48 spacer 1mm
 PL3304805 + PL3304801
6,5 5mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304805 + PL3304801 + PL3304800
7 7mm M48 extension
 PL3304807
7,5 7mm M48 extension + M48 spacer 0,5mm
 PL3304807 + PL3304800
8 7mm M48 extension 7mm + M48 spacer 1mm
 PL3304807 + PL3304801
8,5 7mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304807 + PL3304801 + PL3304800
9 9mm M48 extension
 PL3304809
9,5 9mm M48 extension + M48 spacer 0,5mm
 PL3304809 + PL3304800
10 5mm M48 extension + 5mm M48 extension
 PL3304805 + PL3304805
10,5 5mm M48 extension + 5mm M48 extension + M48 spacer 0,5mm
 PL3304805 + PL3304805 + PL3304800
11 5mm M48 extension + 5mm M48 extension + M48 spacer 1mm
 PL3304805 + PL3304805 + PL3304801

11,5

 5mm M48 extension + 5mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304805 + PL3304805 + PL3304801 + PL3304800
12 5mm M48 extension + 7mm M48 extension
 PL3304805 + PL3304807
12,5 5mm M48 extension + 7mm M48 extension + M48 spacer 0,5mm
 PL3304805 + PL3304807 + PL3304800
13 5mm M48 extension + 7mm M48 extension + M48 spacer 1mm
 PL3304805 + PL3304807 + PL3304801
13,5 5mm M48 extension + 7mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304805 + PL3304807 + PL3304801 + PL3304800
14 7mm M48 extension + 7mm M48 extension
 PL3304807 + PL3304807
14,5 7mm M48 extension + 7mm M48 extension + M48 spacer 0,5mm
 PL3304805 + PL3304807 + PL3304800
15 7mm M48 extension + 7mm M48 extension + M48 spacer 1mm
 PL3304807 + PL3304807 + PL3304801
15,5 7mm M48 extension + 7mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304807 + PL3304807 + PL3304801 + PL3304800
16 7mm M48 extension + 9mm M48 extension
 PL3304807 + PL3304809
16,5 7mm M48 extension + 9mm M48 extension + M48 spacer 0,5mm
 PL3304807 + PL3304809 + PL3304800
17 7mm M48 extension + 9mm M48 extension + M48 spacer 1mm
 PL3304807 + PL3304809 + PL3304801
17,5 7mm M48 extension + 9mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304807 + PL3304809 + PL3304801 + PL3304800
18 9mm M48 extension + 9mm M48 extension
 PL3304807 + PL3304809
18,5 9mm M48 extension + 9mm M48 extension + M48 spacer 0,5mm
 PL3304807 + PL3304809 + PL3304800
19 9mm M48 extension + 9mm M48 extension + M48 spacer 1mm
 PL3304807 + PL3304809 + PL3304801
19,5 9mm M48 extension + 9mm M48 extension + M48 spacer 1mm + M48 spacer 0,5mm
 PL3304809 + PL3304809 + PL3304801 + PL3304800