Tele Vue Extension Tube for 2.4" Imaging Accessories Size:0.040" and hard stops

and hard stops

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Coma is a common plague of the Newtonian reflector design

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Tele Vue Extension Tube for 2.4" Imaging Accessories Size:0.040" and hard stopsThese extension tubes allow the user to establish the correct distance between a field lens and an imaging device. This black anodized aluminum ring features reflection reducing threads that enhance image contrast by reducing the possibility of internal reflections. Focuser extensions of varying sizes are frequently used to create the required distance for proper field lens to imager spacing. The necessary distance will differ depending on your camera