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Rubinar ((ロシア語:Рубинар)) is a Soviet lens design series with long focal lengths, yet compact, developed and produced by JSC Lytkarino Plant of Optical Glass (LZOS). Rubinars can be used with proprietary mount cameras by using M42 adaptors. Focusing motors are absent though (manual only), and so are the variable apertures. == Variants == * MC Rubinar - 1:8.0 500 mm * MC Rubinar - 1:4.5 300 mm * MC Rubinar - 1:5.6 500 mm * MC Rubinar - 1:10 1000 mm * Rubinars may be transformed into spotting scopes using an M42 ''Turist-FL'' ocular attachment and image redresser. Their optical arrangement gives flexibility in placing the focal plane and changing the focal ratio by mere refocus.〔()〕 * Astro-Rubinar is a Rubinar 1000 mm kit including oculars and a 90° prism for convenient use as a visual telescope.〔(), ((version in English) )〕 * MTO (Russentonne) is a different related lens design, with a single Maksutov achromatic corrector. The Rubinar uses 2 milder such full aperture plates, being slightly shorter, lighter and ultimately better corrected, thanks to more decentering tolerance.〔()〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rubinar」の詳細全文を読む スポンサード リンク
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