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There are several focal lengths:
4.5
6.5
10.0
15.0
20.0
25.0
30.0
All the above 1.25"
40.0
2"
They are getting good reviews. They do not all have eye reliefs long enough for glasses, and eye reliefs vary, but in focal lengths shorter than 15mm, they all have much longer eye reliefs than Plössls or Orthos.
Inexpensive, and water-tight sealed as well.
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