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TECHSPEC 30mm - 50mm Length, C-Mount Fine Focus Tube

Stock #03-625
Qty 1-4
Qty 5
Volume Pricing
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Extension Tube
Extension Length (mm):
30.0 - 50.0
Barrel Thread:
M18 x 0.5
Clear Aperture CA (mm):
Inner Diameter (mm):
Outer Diameter (mm):
Thread Type:
Fine Focus Tube

Regulatory Compliance

Reach 197:
RoHS 2015:

Product Family Description

  • C-Mount Thread for Wide Compatibility Range
  • Extension Lengths Available from 20 – 90mm
  • Fully documented with 3D Models and Technical Drawings

TECHSPEC® C-Mount Fine Thread Focus Tubes are used for precision positioning of an optic. These tubes feature a 30mm diameter outer barrel with male thread at the base end, which has a secondary finely threaded interior barrel to allow for fine focusing. The secondary barrel has a female thread, knurled ring at the front end, and threaded interior for light baffle. Set screws can be used to fix the position. TECHSPEC® C-Mount Fine Thread Focus Tubes are available in lengths ranging from 20mm to 90mm.

Note: Compatible allen wrench (#56-271) sold separately.

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