Kasai Trading GSO Focal Diameter Japanese Direct Sales 0.5x 1.25-inch Reducer, 31.7mm (Official Product)

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2-element 0.5x focal reducer / Fully multi-coated 31.7mm (1.25 inch) diameter / Mounting standard M28.5 Can be attached to CCD cameras, eyepieces, eyepiece adapters, etc. Plastic case (with urethane pad) included as standard This convenient reducer can be attached to the filter thread at the end of the 31.7mm barrel of a CCD camera or eyepiece. When attached to a standard eyepiece, it provides a reduction ratio of approximately 0.6x (note: this can vary between 0.5x and 0.7x depending on the barrel length and focal position). It's not only extremely useful for direct-focus imaging of nebulae and star clusters with a CCD, but also for visual observations when you want to easily obtain low magnification and a wide field of view with a handheld eyepiece. It features a fully multi-coated two-element lens. A filter thread is provided on the front of the lens cell.