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M23.2 and M27.5 Tube System Retaining Rings

M23.2 Retaining Ring Pair for 6mm Diameter Optics, #85-566
M23.2 Retaining Ring Pair for 6.5mm Diameter Optics, #85-565
M23.2 Retaining Ring Pair for 9mm Diameter Optics, #85-564
M23.2 Retaining Ring Pair for 10mm Diameter Optics, #85-563
M23.2 Retaining Ring Pair for 12mm Diameter Optics, #85-562
M23.2 Retaining Ring Pair for 12.5mm Diameter Optics, #85-561
M23.2 Retaining Ring Pair for 12.7mm Diameter Optics, #85-560
M23.2 Retaining Ring Pair for 15mm Diameter Optics, #85-559
M23.2 Retaining Ring Pair for 18mm Diameter Optics, #85-558
M23.2 Retaining Ring Pair for 20mm Diameter Optics, #85-556
M27.5 Retaining Ring Pair for 25mm Diameter Optics, #85-597

M23.2 Retaining Ring Pair for 6mm Diameter Optics, #85-566

M23.2 Retaining Ring Pair for 6.5mm Diameter Optics, #85-565

M23.2 Retaining Ring Pair for 9mm Diameter Optics, #85-564

M23.2 Retaining Ring Pair for 10mm Diameter Optics, #85-563

M23.2 Retaining Ring Pair for 12mm Diameter Optics, #85-562

M23.2 Retaining Ring Pair for 12.5mm Diameter Optics, #85-561

M23.2 Retaining Ring Pair for 12.7mm Diameter Optics, #85-560

M23.2 Retaining Ring Pair for 15mm Diameter Optics, #85-559

M23.2 Retaining Ring Pair for 18mm Diameter Optics, #85-558

M23.2 Retaining Ring Pair for 20mm Diameter Optics, #85-556

M27.5 Retaining Ring Pair for 25mm Diameter Optics, #85-597


  • Feature Optic Shelf to Center Optics
  • Sold in Pairs to Secure Optics within Extension Tubes
  • Thin, 3mm Thickness Design

M23.2 and M27.5 Tube System Retaining Rings feature a thin, 3mm thickness. They are sold in pairs, and are ideal for securing optics within extension tubes. Each retaining ring features an optic shelf which centers the optic within when sandwiched between retaining ring pairs.

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