Manufacturer brand item PMT-2513 TVBL25XN Tele Vue Barlows An Optically Window ProperlyBarlows do things. First, they amplify power retaining eyepieces eye relief. Second, they slow telescopes f , which improves eyepiece sharpness. Third, designer can introduce compensations for eyepiece aberrations. 2. 5X Powermate Barlow is a 4 element parfocal, compact amplifying lens system. POWERMATE has a negative achromatic doublet plus a positive ... Please contact Adorama's customer service for ordering information, payment options, order tracking, return policy and guarantee offered.
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