Howie Glatter ORIGINAL FINE THREAD Crosshair and Circle Scope Pattern Projection Attachment (LIMITED QUANTITIES)

This is one of the last holographic disks that Howie Glatter made with the original fine thread. Recently, Starlight Instruments changed the thread to a coarse one and so none of the new disks will fit the older collimators. We have a small quantity of these disks left to fit these collimators.

These optional holographic attachments screw into the laser aperture and have a white screen front surface. They contain an optical element that diffracts most of the laser light into a diverging symmetrical pattern around the central beam. The projected pattern is useful for centering optical elements by making it symmetrical with the edge of the optic

We have only one version left in stock which is this one:

• A cross-hair and circle “scope” pattern is available that spans 10 degrees. It has utility for non-Barlowed, conventional Newtonian primary collimation, where the primary is adjusted to return the reflected central laser beam back into the laser aperture of the collimator. The cross-hair intersection makes it easier to see when the return beam is centered on the collimator face.