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Home > Laser Collimators > Howie Glatter Circular Diffraction Attachment for collimating RC with laser

Howie Glatter Circular Diffraction Attachment for collimating RC with laser

Howie Glatter Circular Diffraction Attachment for collimating RC with laser
Glatter Laser Collimator 532nm Bright Green Circular Diffraction Pattern for RC Glatter Laser Collimator 532nm Bright Green Stepped
Price: £32.00
Product code: HGHA-CIR
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This Glatter 1.25-2” stepped bright green laser collimator is the best tool for imagers using Altair Ritchey Chretien’s (RC’s) or Cassegrain telescopes. 
The Glatter collimator usually produces a dot-style beam pattern if used on it’s own, therefore we recommend you order this concentric-circle target pattern attachment which makes collimation of your RC or Cassegrain primary and secondary mirrors possible.
This is achieved projecting the target against a surface such as a wall, while adjusting the primary and secondary mirrors. Choose the circular diffraction target option opposite when ordering. There are several online resources and methods for collimating your RC using this method. 
We aren’t going to recommend one approach over others as there are many, and we can't take responsibility for content on the web, however we would suggest you at least view these You Tube Videos done by a very helpful British gent. Note: A red laser is used indoors in the video, but as we've said, green is far more visible in any situation. Also the use of a tilt-adjuster is recommended in the video to square the focuser. This may or may not be required depending on the focuser and imaging train but is more often required than not. Finally, bear in mind the video shows how to collimate the telescope but doesn't cover the final collimation with camera attached on a star-image. Often if this procedure is followed, tweaking the collimation on a star isn't required, but sometimes the introduction of imaging accessories necessitates it.
Without further adieu, here are the videos: (all open in new windows)
Availability: You can pre-order on this web-page. Product is already on order with supplier, stock expected in September 2014

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