The Howie Glatter Parallizer is a cleverly designed 2" to 1.25" eyepiece adapter that ensures eyepieces, imaging equipment, and collimating devices remain parallel to the drawtube of the focuser even when the clamp screw of the adapter is tightened. This is especially important in fast optical systems such as Dobsonians and refractors because even a small angular misalignment can cause image degradation for visual observing and imaging. The easy-to-use Howie Glatter Parallizer eyepiece adapter works by clamping each cylindrical surface between two parallel straight edges for stable alignment to provide a precise, tight, and wiggle-free fit. The adapter's non-marring clamp screw is set at 45 degrees and pushes the accessory down against the adapter flange when tightened. The patented Parallizer has zero in-focus loss, requires no screw slot to seat fully in a drawtube, and is threaded for 48mm (2”) filters. The Parallizer was selected as a Sky and Telescope Hot Product for 2012.