Changing batteries
Your Laser Colli
TM
has been adjusted with the greatest of care for lifelong
service. It does not need to be removed from it’s housing for changing the
batteries. Simply turn the buckle connecting the pendant on the back of the
laser counterclockwise approximately three turns to open the battery com-
partment. This procedure will not alter the laser adjustment!
Replace worn-out batteries with three round “hearing aid“ batteries 1.4 Volt
(such as VARTA V675 or Panasonic PR 675 H)
Do not attempt to loosen the headless set-screws, which center the laser
within the metal body of the Laser Colli
TM
. Most likely you will not be able to
recover precise adjustment without extensive auxiliary equipment. The set
screws are marked with an indicator to show whenever any of the six screws
was reoriented by the user.
Please understand that precise adjustment is about the most time consuming work during the pro-
duction of the Laser Colli
TM
. Factory realignment is expensive and involves two times freight
charges. So better not to tamper with the adjustment, it’s at it’s best already.
Note:
The diameter of the exiting laser beam almost matches the diameter of the
small hole in the reference glass.
For this reason it is possible that the beam slightly lights up on the rim of the
center hole.
This has no negative effect whatsoever on precision or functionality
of our Laser-Colli™.
Zur Sternwarte • 82291 Mammendorf • Tel.08145/8802 • Fax 08145/8805
www.baader_planetarium.de • service@baader-planetarium.de • www.celestron.de
DOK: G\engl\manuals\LaserColli-0505-e.doc
A word of caution when collimating SC’s and other Catadioptric OTA’s:
In any Newtonian telescope it is a commonly accepted procedure, to mark the center of the primary mirror with a
small circle, before attempting collimation.
It is “The“ most important action in order to ensure control over the process of collimation (Aristotle’s: “Give me a
fixed point in space and I will unlatch the earth from it’s path“).
In terms of an SC-optical system, this would mean to mark the very center of the convex secondary (!) mirror, so as
to ensure the laser beam stays within the rotational center of the optical system.
The downside is that most visual back accessories in present day SC-OTA’s are made so sloppy that the precondi-
tion mentioned above will not be met.
Even with the best tools – a sufficiently sharp and well adjusted laser beam with a precision chrome sleeve, you must
ensure that the laser will hit the SC-secondary dead center, so that the reflected beam will truly indicate the offset of
the secondary adjustment, rather than the offset from the secondary’s center.
Putting a tiny center “ring“-mark onto a secondary is not a difficult task, when the SC-OTA has a provision to quickly
un-mount the secondary mirror – such as it is the case with CELESTRON’S FaStar-Optics.
The procedure is essentially the same, as described earlier for the center mark on a Newtonian primary.
In any case – if you do not feel happy with marking the secondary mirror of your telescope, please stick with the “real
star“ collimation techniques as described in the manual of your Schmidt-Cassegrain telescope.
We cannot take any responsibility for damaged optics sets due to careless or otherwise wrong optical handling.
