Tele Vue 2.5x Powermate 1.25 inch Image Amplifier PMT-2513

What the Powermate is and who uses it

The Tele Vue 2.5x Powermate is a 1.25 inch image amplifier that multiplies eyepiece focal length by 2.5 times while preserving eye relief and correcting pupil aberrations. Its four-element telecentric design keeps field rays parallel, making it suitable for both visual observation and planetary imaging with CCD or film cameras. Astronomers who want higher magnification without stacking Barlows will find it useful.

What to check on your telescope before ordering

Verify that your focuser accepts 1.25 inch barrels and that your star diagonal can reach a parfocal point with this unit. The Powermate includes a safety undercut on the chrome barrel and captive lock screws that cannot fall out. A T-ring adapter is accepted for direct camera attachment, so confirm your camera’s thread type if you plan to image.

Behaviour during extended imaging sessions

Telecentric operation prevents ray divergence, which is ideal for narrow-band filters such as Hydrogen-alpha systems including Daystar models. The manufacturer’s 100 percent quality control at f/4 ensures the amplifier adds power without introducing additional aberrations during long exposures. Magnification remains nearly constant regardless of image distance behind the top surface, so focus stability is maintained over time.