Skip to content
Stargazing June 15th ✦ 6pm-10pm
Stargazing June 15th ✦ 6pm-10pm

Borg Helical Focuser S - 1.25" (non-rotating)

by Borg
SKU B7315

Delayed Shipping More on the way:
This product will not ship immediately. Contact us for estimated delivery.

This helical focuser from Borg is a popular replacement for the stock helical focuser on the Lunt LS50 solar telescope. Use this adapter to attach the Borg to the Lunt.

The deluxe version of model 4317, this non-rotating helical focuser includes index marks on the outside of the barrel, which greatly facilitate focusing when switching between CCD camera and eyepiece. In addition to visual use, this focuser also works well for fine focusing of CCD cameras, digital still cameras and video cameras. The front attachment is a metric M36.4 P1.0 male thread, or a 1.25" eyepiece interface when used with adapter 7316 (which includes threads for 1.25" eyepiece filters). The rear attachment includes a T-thread for direct connection to many CCD cameras.


  • Index: 50 microns
  • Length: 50 to 60 mm
  • Travel: 10 mm travel
  • Weight: 80 g
  • A: 31.7 mm (1.25") sleeve, M42 P0.75 Male
  • B: M36.4 P1.0 Male