Howie Glatter Holographic Attachment for Laser Collimator - Concentric Circle Pattern

You have the option to enhance your laser collimator with holographic attachments that securely screw into the laser aperture, featuring a white screen front surface. These attachments incorporate an optical element that disperses the majority of the laser light into a symmetrical pattern diverging around the central beam. This projected pattern serves the purpose of centering optical elements by aligning them symmetrically with the edge of the optic.

There are three distinct patterns to choose from:

10 x 10 Line Square Grid Pattern: This pattern is provided as standard unless otherwise specified due to its wide coverage. It spreads across 21 degrees, enabling the centering of optics even in fast telescopes with a focal ratio of f/2.7. Recommended for general use, it accommodates the fastest telescopes typically encountered.

Nine-Concentric Circle Pattern: Spanning 10 degrees, this pattern is suitable for optics around the focal ratio of f/5.7 or slower. It reaches the edge of optics more effectively than the square grid pattern. The brighter illumination of this pattern proves particularly advantageous with Cassegrain scopes, where the impact of the pattern on mirror surfaces is often scrutinized. As the projected pattern is visible primarily due to scattered light from dust, dirt, or optical imperfections, a brighter pattern enhances visibility, especially when dealing with very clean mirrors.

Cross-Hair and Circle "Scope" Pattern: Covering 10 degrees, this pattern is useful for primary collimation in non-Barlowed, conventional Newtonian telescopes. In this context, the primary mirror is adjusted to reflect the central laser beam back into the collimator's laser aperture. The intersection of the cross-hair facilitates easy visualization of when the return beam is precisely centered on the collimator face.