Howie Glatter Parallizer 2" to 1.25" Adapter

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Howie Glatter Parallizer 2" to 1.25" Adapter
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  • Eyepieces and imaging systems work best when everything is perfectly square to a telescope's optical axis. The Howie Glatter Parallizer is a patented 2" to 1.25" adapter that keeps accessories in parallel alignment within a focuser or draw tube.
  • The Howie Glatter Parallizer employs two parallel lines of contact and an opposite clamping point of contact for each of the inner, and outer surfaces. These four parallel lines, two forming a seat for the 2" drawtube, and two forming a seat for the 1.25" accessory, assure drawtube-to-accessory axis parallelism.
  • Why get a standard 2" to 1.25" adapter when you can get a Parallizer for just a few dollars more?
  • The Glatter Parallizer is threaded for 2" filters.


Howie Glatter Parallizer

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 centering. There are adapters and holders on the market that are advertised as "centering" or "self-centering", but even if an accessory is pushed off-center by a millimeter 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 centering is nice, but parallelism is golden.

The Howie Glatter Parallizer™ 2" to 1.25" Adapter has a patented design that insures dead 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. The straight edges can be seen in the photo to the left, looking down the 1.25” barrel.

Because the inner and outer straight edges are parallel with each other to 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.

Additional Information

Additional Information

Manufacturer Howie Glatter
Warranty 1 Year Warranty
Included Items

Included Items

  • Howie Glatter Parallizer 2" to 1-1/4" Adapter
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