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.
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.
Jun 25, 2014
A must have!Pros:
Lightweight,Strong Construction,Quality Lenses,Accurate,Easy to Use,CompactCons: Comments:
It's so much more precise than just the "small hole" accessory!
The problem with the ring stuck in the middle of newtonians' primary mirrors is it diffracts the laser light, even when precisely aiming at the exact centre, so the tight spot you can see everywhere else suddenly turns into a hazy blot!
Now you can precisely centre the ring without worrying for the blurry centre pattern (that'll stay blurry anyway) : just centre the holographic "target" pattern around the ring and you're done! So much faster and easier!
Definitely a must have to complete your precisely machined Howie Glatter laser collimator! Fits all 2", 1"1/4 and combo models, as usual.
This review was provided courtesy of AgenaAstro.comSort by