Starlight Instruments Holographic Attachment
The self-Barlow attachment is a disc with a white screen on the front and a small built-in Barlow lens in the center of the disc. It is then screwed into the Howie Glatter laser collimator(sold separately) aperture and provides a highly compact method for Barlow-collimating.
Concentric Circle Projection Attachment as with regular Barlowed laser collimation, the shadow is projected onto the screen at the front of the disc at the focuser end so adjusting the mirror at the back of the scope can be difficult in some cases, especially with reflectors having a long focal length.
Concentric Circle Projection Attachment
A nine-concentric circle pattern that spans 10 degrees and will reach to the edge of f/ 5.7 optics. Recommended for scopes around this focal ratio or slower. The Laser light is spread over a smaller area it is brighter than the square grid pattern, this makes it particularly useful with Cassegrain scopes, where the pattern impact is sometimes scrutinized on the mirror surface. The projected pattern is seen only by light that is scattered from dust, dirt, or optical roughness, so a brighter pattern is better, especially if the mirrors are very clean.
Cross-hair & Circle Projection Attachment
Useful for aligning the returning beam on collimator face.
A cross-hair and circle
Square Grid Projection Attachment
This pattern is recommended for general use because it can be used with the fastest telescopes likely to be encountered.
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