HOWIE GLATTER 1.25" BLUG
Item No. 747-20000
Manuf. No. Howie Glatter HGBL1.25
The Blug (tm) is a new collimation product, used in conjunction with a regular laser collimator in single beam mode, to perform the Barlowed laser primary mirror alignment technique of Nils Olof Carlin (BLUG stands for Barlow plug). It has a matte-white 45 degree face as a screen, and a Barlow lens installed in a central axial hole. The BLUG is inserted in the inner end of the focuser drawtube, inside the tube or upper cage, and is retained by compression of an o-ring in a groove in the Blug base. The 45 degree white face of the Blug is easily visible from primary adjustment position on a truss DOB, or with a solid tube, if the BLUG face can be seen through the space between the primary and tube wall. With a solid tube scope the BLUG can be turned 180 degrees to face the front so the Barlowed shadow can be seen easily from the front of the scope. The Blug is sized to the drawtube, not to the collimator. For example, a 1 1/4" collimator with a 1 1/4" to 2" adapter could be used with a 2" Blug.
- Contains a Barlow and a white 45 degree surface to see return shadow of mirror center mark.
- Plugs into base of focuser so is easily visible from front of scope or even from the bottom of the scope on a truss-tubed Newtonian.
- Comes with extra O-rings for a snug fit on all focusers, and instructions for use.
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Telescope Accessories 
