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PrimaLuceLab T2 extensions are available in different lengths and they present on both sides of a T2 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 T2 extensions and spacers, by ordering different combinations you can adjust the thickness of your personalized extension, in 0.5mm steps!

T2 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)

9mm T2 extension

T2 extension installed (together with the M48 female to T2 male adapter) between camera and corrector in order to correctly set backfocus.

9mm T2 extension: specifications
- Thickness: 9mm
- Material: aluminum
- Black anodizing
- T2 male and female thread on sides
- External knurling to improve grip

9mm T2 extension

T2 extensions can be screwed together. In order to set the perfect thickness you need, you can also add the T2 1mm and 0.5mm spacers in between.

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 T2 extension
 PL3304205
5,5 5mm T2 extension + T2 spacer 0,5mm
 PL3304205 + PL3304200
6 5mm T2 extension + T2 spacer 1mm
 PL3304205 + PL3304201
6,5 5mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304205 + PL3304201 + PL3304200
7 7mm T2 extension PL3304207
7,5 7mm T2 extension + T2 spacer 0,5mm
 PL3304207 + PL3304200
8 7mm T2 extension + T2 spacer 1mm
 PL3304207 + PL3304201
8,5 7mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304207 + PL3304201 + PL3304200
9 9mm T2 extension PL3304209
9,5 9mm T2 extension + T2 spacer 0,5mm
 PL3304209 + PL3304200
10 5mm T2 extension + 5mm T2 extension
 PL3304205 + PL3304205
10,5 5mm T2 extension + 5mm T2 extension + T2 spacer 0,5mm
 PL3304205 + PL3304205 + PL3304200
11 5mm T2 extension + 5mm T2 extension + T2 spacer 1mm
 PL3304205 + PL3304205 + PL3304201

11,5

 5mm T2 extension + 5mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304205 + PL3304205 + PL3304201 + PL3304200
12 5mm T2 extension + 7mm T2 extension
 PL3304205 + PL3304207
12,5 5mm T2 extension + 7mm T2 extension + T2 spacer 0,5mm
 PL3304205 + PL3304207 + PL3304200
13 5mm T2 extension + 7mm T2 extension + T2 spacer 1mm
 PL3304205 + PL3304207 + PL3304201
13,5 5mm T2 extension + 7mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304205 + PL3304207 + PL3304201 + PL3304200
14 7mm T2 extension + 7mm T2 extension
 PL3304207 + PL3304207
14,5 7mm T2 extension + 7mm T2 extension + T2 spacer 0,5mm
 PL3304205 + PL3304207 + PL3304200
15 7mm T2 extension + 7mm T2 extension + T2 spacer 1mm
 PL3304207 + PL3304207 + PL3304201
15,5 7mm T2 extension + 7mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304207 + PL3304207 + PL3304201 + PL3304200
16 7mm T2 extension + 9mm T2 extension
 PL3304207 + PL3304209
16,5 7mm T2 extension + 9mm T2 extension + T2 spacer 0,5mm
 PL3304207 + PL3304209 + PL3304200
17 7mm T2 extension + 9mm T2 extension + T2 spacer 1mm
 PL3304207 + PL3304209 + PL3304201
17,5 7mm T2 extension + 9mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304207 + PL3304209 + PL3304201 + PL3304200
18 9mm T2 extension + 9mm T2 extension
 PL3304209 + PL3304209
18,5 9mm T2 extension + 9mm T2 extension + T2 spacer 0,5mm
 PL3304209 + PL3304209 + PL3304200
19 9mm T2 extension + 9mm T2 extension + T2 spacer 1mm
 PL3304209 + PL3304209 + PL3304201
19,5 9mm T2 extension + 9mm T2 extension + T2 spacer 1mm + T2 spacer 0,5mm
 PL3304209 + PL3304209 + PL3304201 + PL3304200