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* Attaches to laser aperture for making the primary mirror adjustment quick, efficient and compact.
* The Howie Glatter Barlow Laser Collimator Barlow Attachment diverges the beam just behind your barlow lens for accurate alignment.
* Allows the user to make solo adjustments.
* The Howie Glatter Barlow Laser Collimator Barlow Attachment fits the threaded aperture of any of Glatter holographic collimator.
* Disc attachment with a small mounted barlow lens and flat white front surface screen.