TS Optics 1.25" Concenter - collimation eyepiece for Newtonian telescopes
Simple adjustment of primary and secondary mirror
The alternative to all adjustment methods on the market! Now the center
of the secondary is being taken into account (without a mark in the
center). The adjustment is being done with the fully illuminated focuser
. Even the Newtonian offset is considered.
The Concenter is being produced especially for TS
The Concenter consists of a Chesire-like tube with the big difference: a special made disk with rings on it.
The adjustment process uses the edge of the secondary mirror which means that also the offset is being taken into account.
This is much more precise than a laser as it covers the entire field and not just the center.
The Concenter uses the film container method supplemented by the
concentric rings. The adjustment can be done on daytime and also at
dawn, just a little bit of rest illumination is necessary.
Your collimation takes the offset of the telescope into account
(mechanically solved offset assumed). If you already have a center mark
on your secondary mirror, it is not visible in the center of the
concentric rings but shifted by the offset. Only if you have a
pre-calculated offset mark on your secondary, it appears centric in the
concentric rings.Collimation instruction
hold the adjustment eyepiece in your hand, you will notice a transparent
plastic disc with a central bore and concentric engraved circles inset
on the telescope side at the lower end.
At the other end you will find a central hole, which is chosen so small
that the eye has no opportunity to avoid centering when looking through.
After inserting the collimation eyepiece into the focuser you will see
faint translucent rings in front of the optical components of the
1. Collimation of the focuser
Cover the main mirror and pay attention to a good illumination. Now the
secondary mirror, a rectangular mounting of the focuser supposed, is
adjusted so that it appears between the circles of the collimation
cicles and without offset.
With the focus control of the focuser you can bring the outer edge of
the secondary mirror and the matching circle to cover. Even small
deviations from the ideal position are recognized immediately.
2. Alignment of the secondary mirror to the main mirror
While looking into the eyepiece, the tilting is changed by means of the
screws of the secondary mirror until the bright reflection of the main
mirror in the secondary mirror is concentric with the circles.
3. Alignment of the main mirror to the optical axis
In the dark it requires a good illumination of the annular disc, e.g.
with a LED lamp. Now the primary mirror center marker can be adjusted
between the brightly lit circles.
Reflections from concentric circles on the secondary mirror can cause
confusion in the beginning. Practice handling before the set is used for
the first time.
Adjust only to the primary circles in the collimation eyepiece.
A final adjustment on the star is not necessary an exact adjustment presumed.
1.25" concenter eyepiece
Simple adjustment of primary and secondary mirror - Newtonian offset considered