Sky &Telescope Hot Product 2012
The Howie Glatter Parallizer is an innovative 2-to-1¼-inch adapter with a patented mechanism that precisely centres and squares your eyepiece, collimation device or camera to the telescope's optical axis.
Threaded to accept standard 2-inch filters.
Consistent, repeatable parallel alignment of accessories within a drawtube or focuser is important for imaging and for collimating, and it has become even more critical with the popularity of ultra-fast focal ratios, larger image chips, and precision collimating tools.
There is a misconception that the problem of the cylindrical slip-fit system we use for eyepieces and other optical accessories is centring. There are adapters and holders on the market that are advertised as "centring" or "self-centring", but even if an accessory is pushed off-centre by a millimetre it will not introduce a significant problem if the accessory and holder axis remain parallel. In contrast, angular misalignment between the accessory and the drawtube axis of even a few arc minutes can be detrimental, especially for collimation and imaging. The bottom line is that centring is nice, but parallelism is golden.
The Parallizer™ 2 inch-to-1.25 inch adapter has a patented design that insures precise parallel alignment between a 2” drawtube and a 1.25” accessory. It works by clamping each cylindrical surface between two parallel straight edges, in order to secure stable alignment. It is like dropping a cylinder into a V-block : totally wiggle-free.
Because the inner and outer straight edges are parallel with each other to a high accuracy, precision alignment between the drawtube and the accessory is assured. The adapter's non-marring clamp screw is set at 45 degrees, pushing the accessory down against the adapter flange when tightened. The Parallizer has zero in-focus loss, and doesn’t require a clearance slot in a drawtube to seat fully. It is threaded for 48mm (2") filters.