ALL AMERICAN MADE from American
Self-Centering Adapter (SCA)
The HoTech laser collimator separates itself from all the other laser
collimators with its innovative self-centering adapter technology (SCA).
The mechanism allows precise and repeatable installation in all brands
of 1.25" and 2" telescope focusers. All laser collimators in the current
market have one fundamental problem - the slop in the adapting mechanism
between the laser collimator and the telescope focuser. This problem is
clearly recognized and often discussed among astronomers but so far
there is no definite solution in the market yet.
Self-Centering Adapter cleverly eliminates the slop by linearly
compressing the built-in rubber rings. By doing this, the diameter of
the rings expands to compensate the gap. Because all rings evenly expand
radially in diameter from the compression, this automatically centers
the laser collimator in the focuser draw tube. The SCA adapter
accommodates various brands of adapting focusers which have slightly
different manufacturing inside diameters so our laser collimator will be
precisely centered for each installment.
Many laser collimator
manufacturers give users the wrong impression, “big and heavy means
rugged and stable.” Instead, HoTech engineers successfully cut the
unnecessary weight on the laser collimator because we understand that
additional weight on a telescope (especially open structure Newtonians)
will create imbalance and structure sagging. The SCA-Collimator is made
with aero-space grade lightweight aluminum material and CNC machined
with the tightest tolerances, then sand blasted and anodized to protect
from harsh environment. Nothing has been sacrificed while you get a long
lasting state-of-the-art collimation instrument.
viewer helps to display the returning laser spot with a clear visual
reference during adjustment. The faceplate allows you to align your
primary mirror from the rear of the telescope
eliminating traveling to the front of your scope repeatedly during
HoTech understands the importance of this, so the faceplate is a
standard feature in our laser collimator.
All astronomers deserve to have it without paying any extra!
In addition, the faceplate viewer’s pattern
is laser engraved to ensure a long lasting sharp targeting grid. Unlike
other collimators, the target is not a sticker that will peel, or paint
that can rub off or chip. We understand that you are paying for a
precision instrument that is supposed to be well made.
the laser dot to the finest point is the key to precision collimation.
But when you look closely at the laser dot from brand to brand, most
laser dots appear large, not really a fine point as you imagined. This
means there is guess work involved when you try to center the dot; not
just centering the laser dot to the center of the faceplate, but also
centering the center of the dot itself. This does not make any sense
when you are trying to take the advantage of the collimated laser beam's
characteristic "which has a low beam divergence, so that the beam radius
does not undergo significant changes within moderate propagation
distances." In other words, the laser beam size within the collimation
distance (laser collimator to
the primary mirror and back to the faceplate) should remain a constant
fine point. As you know, most laser collimator brands are not really
laser manufacturers. They install an off-the-shelf laser module or
pointer and align the laser in a tube without REALLY considering the
user’s application, namely the operating distance for a laser beam size.
HoTech has been designing and building laser modules and systems for
over 10 years for various professional industries. We know exactly how a
laser should work. HoTech limits the laser beam to the finest size in
the correct operating distance for optimal effect. Our understanding and
experiences with the laser design permit you to have an effective and
High Accuracy Laser Alignment
The SCA-Collimator is well centered and aligned which are critical
factors for an accurate collimation. But you will be surprised that many
laser collimators in the market fail in this regard. The reason is in
the design and understanding of the product itself.
HoTech considered all aspect of parameters in their design. Parameters
like the alignment mechanism, mechanical and optical structure of the
laser itself, and more are taken as part of our design. For instance,
some laser collimators actually install an off-the-shelf laser pointer
in the casing. It is very cost effective (for seller), but it inherits
numerous problems. In many cases, the laser pointer might not install
perfectly centered in the casing due to pointer size variations and the
added alignment mechanism. So the laser itself is not positioned on the
true alignment point and optical axis. As the result, the laser can
never be center-aligned in the enclosure. It is possible to align the
laser beam parallel to the optical path but always with an offset along
the optical axis. This means the laser beam is off no matter how you
center adapt the laser collimator to the focuser. The result of
off-centered laser will introduce astigmatism into your telescope.
By using the CR123, 3V battery as our laser power source, our laser
collimator has over 65 hours of continuous use battery life time. The
included CR123, 3V lithium battery operates well under a typical cold
night and it has a 10 years shelf life. This is a great advantage that
you don't have to worry about changing the tiny hard to find cell
batteries frequently in the dark like other collimators.
1.25" Laser Collimator: Single complete laser collimator with built-in
2" Laser Collimator: The unit works for both 2" and 1.25" telescopes. It
comes with a 1.25" SCA laser collimator pre-loaded in a 2" to 1.25" SCA
The SCA Laser Collimators work with all Newtonian telescopes
using standard 2" or 1.25" focusers.
Due to the convex shape secondary mirror surface on SCT, CT, and
Maksutov telescopes, the mirror will expand the returning collimating
laser to a larger spot making it harder to discern the center of the
return laser spot for collimation. For best result, the single laser dot
laser model is more suitable for the SCT collimation for ease of finding
the center of the expanded spot.
For superior results on SCT, CT, and Maksutov, we recommend the
Advanced Laser Collimator.
1.25" SCA-Collimator $89.95