Tele Vue T-Ring Adapter for Tele Vue PowerMate Barlow
For your newer version Tele Vue PowerMate Barlow lens, this threaded adapter replaces the eyepiece holder on the 1.25-inch 2.5x and 5x models. Just unscrew the black 1.25-inch eyepiece retainer from the optics barrel and the Tele Vue T-Ring Adapter - PTR-1250 threads directly on. The adapter has T-threads to permit the use of a T-ring for connecting a 35 mm camera directly to the Tele Vue PowerMate for astrophotography.
This adapter works best with short focal length refractors capable of using 1.25-inch visual accessories. It helps provide crucial mid-magnification levels for terrestrial and lunar photography. Your images will be more magnification than prime focus, but not as much as eyepiece projection. For those interested in CCD imaging, the CCD device can be coupled directly to the adapter. This process requires removing the imager's 1.25-inch nosepiece and exposing female T-threads. The magnification power will vary, dependent on the spacing between the top surface of the Powermate optics and the imaging surface of the chip or film negative. When using the 2.5x Power Mate, magnification decreases linearly from 2.5x at a 1 mm spacing to 2.2x at a 100 mm spacing. With the 5x PowerMate, the magnification increases linearly from 5x at 1 mm to 7.75x at 100 mm, and increasing your exposure times.
Tele Vue T-Ring PowerMate Adapter Features
- Works with new 2.5x and 5x Tele Vue PowerMates
- Compatible with short focal length refractors
- 5 year Tele Vue Warranty