Stellarvue 10 mm M42 Extension Tube

Stellarvue 42 mm Extension Tube - 10 mm Long This Stellarvue 42 mm Extension Tube is 10 mm, 0.394-inch deep, and can be used to add length to your imaging set-up. Stellarvue extension tubes come in a variety of lengths and are stackable so that you can achieve proper focus with different imaging accessories, such as focal reducers, off-axis guiders, cameras, etc.