For economy, up to 6” aperture we recommend the SkyWatcher range. We manufacture higher quality and longer focal length versions ourselves. The lens is held in an adjustable cell in a correctly baffled aluminium tube (the baffles are to eliminate glancing internal reflections) which can be powder coated and which carries a suitable finder and Crayford focuser. The tube assembly can be carried on one of the SkyWatcher equatorial heads.
Achromats and apohhromats are available up to 10” aperture.