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Helps to obtain the correct backfocus for your viewing needs. Made for use with 2-inch (50.8mm) telescope eyepieces with M48 mounted filter threads...

This guide scope features a 30mm aperture and an f/4 focal ratio with a helical focuser. Lightweight and durable due to the aluminum construction, ...

Made from anodized aluminum. This finder base includes two thumbscrews to attach your favorite finder scope. The bottom slot is 34mm wide by 39mm l...