Howie Glatter 650nm Standard Brightness Red Laser Collimator for Reflector - 2"
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Howie Glatter 650nm Standard Brightness Red Laser Collimator - 2" by Starlight Instruments/Feather Touch # SI-LC2-650 We hope that our telescope's optical elements are always perfectly aligned. Unfortunately, this near-perfect alignment is rarely the case, even with a new telescope. It is especially true with telescopes utilizing mirrors to direct light from an object to our eye. Optical alignment of these mirrors needs to be done frequently, especially if the telescope is moved or bumped a lot. This alignment process is known as collimation and using lasers to assist in the process is a relatively new development Howie Glatter was one of the most well-known and trusted names in astronomy lasers and collimation accessories. His uncompromising quality and dedication to excellence not only put his products above the rest - but in high demand as the finest available on today's astronomy market. Howie passed away in 2017 but his legacy continues! His superbly crafted products are once again offered under license by Starlight Instruments (makers of the famed Feather Touch line of focusers and accessories) who machined most of Howie's products for years even before his passing away. The solid-state laser diode in these devices emits an intense, low wattage beam through a small aperture, precisely along the axis of the collimator's cylindrical body. This beam provides a laser-precise reference line allowing alignment of the telescope's optical axes. A laser collimator's beam must be accurately aligned with the collimator's center axis, or the resultant alignment of the optics will be off-center and asymmetric, and the telescope will produce aberrated images. Howie Glatter collimators are built to be highly accurate and resistant to mechanical shock ensuring that internal laser alignment is maintained. The laser is first aligned within 15 arc seconds. Each collimator is shock-tested by hitting it against a block of plastic (to prevent marring), striking it several times on three axes. The laser alignment is rechecked and if it has not changed, the collimator passes. The beam of all red diode lasers is blurry-edged and has an elliptical cross-section. That's why this collimator is supplied with a removable plastic aperture stop having a knife-edge, 1mm pin hole and a screen front. The stop threads into the laser aperture and restricts the beam, producing a tiny circular dot that is more compact and precise. The edge of the pinhole diffracts some of the laser light, forming the concentric rings around the dot which facilitate precise centering. This pattern is especially noticeable across a longer distance, though it may be hard to see across a couple of meters. If more precise centering is needed, especially in shorter focal-length telescopes, we recommend the use of the Glatter TuBlug, or the Glatter Holographic Attachment for Laser Collimator with the Concentric Circle Pattern, with this laser collimator. The collimator lasers are offered with either 650nm (this model) or 635nm wavelengths. Both have the same power output, but because the human eye has greater sensitivity to the shorter wavelength, the 635nm laser appears significantly brighter. 635nm lasers enable collimation in brighter ambient light, whereas this 650nm laser is adequate for darker conditions. This 2" collimator is intended for use in 2" focusers. Additional Specifications:
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