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Tele Vue's Powermates are known for their freedom from aberrations, greater magnification potential, and compact size. They are high performance for image amplification, CCD or film, yet flexible for visual and imaging with all types of telescopes and eyepieces. Essentially Parfocal, and with nearly constant magnification regardless of image distance behind top surface.
Tele Vue's 100% QC program at f/4 insures that your Powermate will add dramatic power - and nothing else - to your favorite eyepieces.