Tightening ring

21.14 € 21.14

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This ring exists in two versions:

Uncorrected version:

  • Use when the telescope is in near vision only.
  • When the astigmatism is weak.
Version for corrective glass:

  • The glass is fixed thanks to a double-sided sticker.
  • Use to have an afocal vision.
  • To correct significant astigmatism.
  • In binocular vision.
1. In case of strong correction:
  • Make a precal of 20 mm. (see LESA FRANCE)
2. In case of weak correction:
  • A template is provided for the probe.


Product Reference BV20.B
Public Price (Taxes Included) 22.30 €