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Extender-TOA 1.6x
For uses requiring more focal length, like planet or deep-sky short objects viewing and imaging, Extender-TOA makes it possible to lengthen the focal by 1.6x, from 1100mm (F/7.3) to 1760mm (F/11.7). Extender restores, at exit, a standard barrel of 50.8mm.
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