This 2" HR Coma Corrector from Explore Scientific helps minimize or eliminate comatic aberration that can be caused by off-axis point sources. It has anti-reflective multicoated lenses to maximize light transmission for brighter and clearer images. It has a textured rubber grip, and includes a 0.75" and a 1.00" adapter to secure your T-adapter.
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I purchased this coma corrector after reading online reviewer's recommendations. I'm using it on a 8" f/3.9 imaging Newtonian and after getting the spacing correct I have pinpoint stars across the field. I would recommend this corrector for anyone imaging with a fast scope, you will not be disappointed.