0.5x focal reducer cuts the telescopes focal length in 0.5 times of original's to get a wider field of view Fully anti-reflection coatings on all air-glass surfaces for increased contrast The focal reducer is great for visual use for a bigger FOV and is indispensable when CCD imaging Fully metal structure design;both the ends of the interface part is 28.5x0.6 thread Directly connect the interface to the eyepiece;there is a very good performance in both visual and photography
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