2" Nosepiece Extension with 48mm Threads (EXT48-12.7)

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This ½" extension is a robust version of T-thread extension tubes. It uses 48 mm threads at both ends (female and male) instead of the smaller 42 mm T-threads. Its internal light baffles are painted flat-black to avoid reflections. Use more than one to increase spacing distance and/or telecompression in 1/2" (12.7 mm) increments.  This type of extension is often referred to as a "barrel extension" when threaded on to eyepiece barrels.  

This extension has a net spacing distance of 0.5" (12.7 mm).

Potential uses:

  • Clear aperture is 44.5mm (1.75") designed to screw onto our 2" Secure-Grip Nosepiece (AP16T) or any 2" nosepiece with 48mm threads that is designed for CCD cameras. 
  • Spacer for the 0.67 CCD Telecompressor (CCDT67) to achieve precise and/or additional telecompression
  • Moves the CCDT67 further into the optical path, requiring less focuser in-travel
  • Use with our 1.25" Adapter (ADA125) when using 2" filters and needing more space for long barrel eyepieces, so as to not strike the filter
  • Extends the eyepiece barrel length of 1.25"/2" eyepieces for use with 2" filters
  • Use with the Advanced Convertible Barlow (BARADV) in front of the MaxBright Diagonal (PMDMAX) for increased magnification
  • Facilitates focus with short focuser-travel systems like Newtonians
  • Use with parfocal rings (obtained elsewhere) to accommodate eyepiece parfocality

In May 2021, the part # changed from A3703 to EXT48-0.5 in order to more clearly reflect its function.