1.25" or 2" Laser Collimator w/t Pattern, 4 quick accurate setup of telescopes

Description

1.25" Laser Collimator
with Pattern
Use a 1-1/4 x 2" adapter for 2" focuser
for quick accurate setup of telescope mirrors & optics
One buyer said  "
Interesting design. I found it Easier to use than most collimators."
If you are Collimating a 3" or a 18" reflector telescope... this will make the task quick and accurate.
I have used an angled target laser before and had some difficulty in achieving an accurate alignment. With this design, it is easy to see where the output beam strikes the secondary mirror, and the main mirror. The pattern shows how well centered the beam is on the secondary, and the diffused center dot shows easily on the target on the main mirror.
On larger telescopes, the pattern shows how well the beam is centered (pic 10) and on smaller scopes the reflected beam on your wall or paper target on the end of the scope, easily shows the centering of the return beam (pic 12).
For larger telescopes with a 2" eyepiece... a return target (made of foam rubber (pic 2))
is provided (placed on the inside of the eyepiece tube (pic7.8.&11) ) to easily align the return beam with the center axis of the eyepiece. The shadow of the main mirror center target will be visible for ease of adjustment
.
If your telescope has no access to the back of the focus tube... you can not use this target.
see pic 6
(return image on reflective target... prior to alignment)
see pic 6
(foam target and columnator)
see pic 9
(Because this target is on the inside surface of the main tube (not way back on the laser at the back of the focuser tube) it is easily viewed )
The most important part of the alignment is the return beam from the main   mirror to the eyepiece...   the beam from the laser should hit the center of  the  secondary mirror, and then hit the center of the main mirror. If you have a  center spot on your mirror (one is included) ... the pattern from my item  'diffuses' the beam so the SHADOW of the center spot is easily seen on the  target. If you cannot use the target (the scope uses 1 1/4 eyepieces, the)  projection of the pattern on a wall etc. will allow you to see that the pattern  is centered on the secondary. (see pic 5)
and you can use your 1.25" to 2" adapter as  required.
The laser is fully adjustable with a 6 point screw system (just like on most finder scope mounts
(0.050 allen wrench NOW included)
)
See my other astronomy Items on eBay