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Elliptical Secondary Mirror 20mm 25mm 30mm 35mm 40mm 42mm 50mm 54mm For Diy Newtonian Reflecting Astronomical Telescope - Lenses - AliExpress
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Amazon.com : HMANE Telescope Reflector Main Mirror 1600mm with Secondary Mirror 40mm, Newton Reflector Spherical Mirror DIY Astronomical Telescope Mirror Kit, 226SQ59LARZVJE14JMZ8XR : Electronics
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