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TPO 2.5X APO Barlow Lens - 1.25" | OPT Telescopes
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Amazon.com : Barlow Lens 5X, Multi-Coated 1.25" 5X Barlow Lens M42 Thread for Telescopes Eyepiece M42 x 0.75mm Thread T-Adaptor, Can be Attached to DSLR or SLR Camera via a Separate Ring
Amazon.com : Bresser Barlow Telescope Lens 5X 31.7 mm / 1.25 Inch 3-Element Design and Multi-Coated : Electronics