31mm Type 5 Nagler Telescope Eyepiece | Telescope.com: Tele Vue
Amazon.com : Tele Vue Nagler Type-6 13mm Ultra Wide Field 1.25" Eyepiece with 82 Degree Field of View : Telescope Eyepieces : Electronics
Tele Vue Nagler Type-5 31mm Ultra Wide Field 2" Eyepiece with 82 Degree FOV EN5-31.0
astronomical optics, part 5: eyepieces
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