Televue T-Ring Adapter for Televue PowerMate Barlow
For your newer version Televue Powermate barlow lens, this threaded adapter replaces the eyepiece holder on the 1.25" 2.5x and 5x models. Just unscrew the black 1.25" eyepiece retainer from the optics barrel and the Televue T-Ring Adapter - PTR-1250 threads directly on. The adapter has T-threads to permit the use of a T-ring for connecting a 35mm camera directly to the Televue Powermate for astrophotography.
The Televue T-Ring Power Mate Adapter works best with short focal length refractors capable of using 1.25" visual accessories. The Televue PTR-1250 helps provide crucial mid-magnification levels for terrestrial and lunar photography.... 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" 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 Televue Power Mate, magnification decreases linearly from 2.5x at a 1mm spacing to 2.2x at a 100mm spacing. With the 5x Powermate, the magnification increases linearly from 5x at 1mm to 7.75x at 100mm... increasing exposure times. However, bright subjects, such as the Power Mate is well-suited for are less sensitive to exposure times.
Televue T-Ring PowerMate Adapter Features
Works with new 2.5X and 5X Televue PowerMates.
- Compatible with short focal length refractors.
5 year Televue Warranty
Televue Product Number: PTR-1250