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This is an adapter allowing you to convert a Canon EF lens and a 1.25" telescope eyepiece to a spyglass. I included M42 version as well. Photo lens have a good quality so a picture is very good (but upside down orientation is a little bit tricky to handle). You can easily get a zoom spyglass or very fast spyglass (with f/1.8 lens for example).
25mm eyepice and 200mm lens result in 8x magnification.