- The Howie Glatter Laser Collimator uses a solid-state 5 milliwatt Class IIIa laser diode that will last trouble-free for many years
- Red laser operates at 635nm; suitable for Barlowed or holographic collimation in higher levels of ambient light or night use
- Aligned to within 15 arc-seconds - providing 0.1” accuracy at a distance of 20 feet
- The 1.25" collimator is machined to very high tolerances
- Shock-resistant to keep its alignment even if bumped or dropped
- Includes a 1mm aperture stop, lithium battery, and plastic storage case
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 is 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 market.
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 builds his collimators 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. Howie shock tests each collimator by hitting it against a block of plastic (to prevent marring), striking it several times on three axes. He then rechecks the laser alignment and if it has not changed, the collimator passes.
The collimators are supplied with a removable plastic aperture stop having a knife-edge, 1mm pin hole and a white screen front. The beam of all red diode lasers is blurry-edged and has an elliptical cross-section. The stop screws into the laser aperture and restricts the beam, producing a tiny circular dot (“impact”) surrounded by a series of concentric rings. The edge of the pinhole diffracts some of the laser light, forming the concentric rings which facilitate precise centering. With the stop attached to the collimator, the beam looks like a star diffraction pattern.
The collimator lasers are offered with either 635nm (this model) or 650nm 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. The 635nm laser is more expensive, but it enables Barlowed or holographic collimation in higher levels of ambient light, whereas the 650nm laser is adequate only for darker conditions.
This 1.25" collimator is intended for use in 1.25" focusers. But the use of a 1.25" collimator is acceptable in a 2" holder if used with a "center accurate" adapter. The adapter can be checked for accuracy as follows:
- Insert the collimator and tighten the adapter
- Check the position of the projected laser beam
- Loosen the adapter, rotate, and retighten
- Observe if the laser spot has wandered from the original spot
- Total length = 3.38" (85.9mm)
- Length of 1.25" barrel = 1.61" (41.0mm)
- Maximum width = 1.32" (33.6mm)
- Weight = 5.7oz. (162g)
- Powered by a CR123A lithium cell (included), giving about 40 hours of service
You May Also Be Interested In...
Our Price: $75.00
Our Price: $35.00