The Tele Vue Powermate 2.5x is a great choice for both imaging and visual use. It minimizes vignetting, edge field aberrations, and pupil movement, which are common issues when using Barlows with long focal length eyepieces. This is ideal for Hydrogen-alpha filter use, such as ...The Tele Vue Powermate 2.5x is a great choice for both imaging and visual use.
It minimizes vignetting, edge field aberrations, and pupil movement, which are common issues when using Barlows with long focal length eyepieces. This is ideal for Hydrogen-alpha filter use, such as with Daystar models. The Powermate also offers high performance for image amplification, CCD, or film.
It is flexible for use with all types of telescopes and eyepieces, and is essentially parfocal, with nearly constant magnification regardless of image distance behind the top surface. Higher magnifications are possible with high optical performance compared to 'doubling up' Barlows. All Powermates will reach a parfocal point in a star diagonal.