TS Concenter 1.25" Adjustment Eyepiece for Newtonian Telescopes

£75.00✓ 2 year warranty

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Model: ts_concenter_1z
Part Number: TSCONCENTER-1Z

TS 1.25"" Concenter - Newtonian Adjustment Tool.

Manufacturers description:

The alternative to all adjustment devices on the market! Here the centre of the secondary mirror is finally perfectly adjusted to the focuser with full illumination (without applying a mark beforehand)! The Newtonian offset is also taken into account. This means that even beginners can achieve perfect adjustment of their Newtonian telescope.

The Concenter eyepiece consists of a closed cylinder, similar to a Cheshire eyepiece. The decisive difference to a Cheshire is the recessed circular disc.

No centre markings on the secondary mirror are required with this product. The adjustment is carried out directly via the edge of the mirror, so that the optical light surfaces match exactly, even taking the offset into account. You adjust much more precisely here than with a laser, above all you can be sure that not only the axis, but also the field are optimally set.

Instructions on how to collimate your Newtonian with the Concenter adjusting eyepiece:

If you hold the adjusting eyepiece in your hand, you will notice a transparent plastic disc with a central hole and concentric engraved circles embedded in the lower end of the telescope. At the other end you will find a central hole, which has been manufactured very small so that the eye has no way of being decentered when looking through it. After inserting the adjustment eyepiece into the focuser, you will see matt translucent rings in front of the optical components of the telescope.

Adjustment of the secondary mirror to the focuser for optimal illumination
This step is done with the main mirror covered. When using the Concenter eyepiece, care must be taken to ensure good illumination. The secondary mirror, assuming the focuser is installed at right angles, can now be adjusted in such a way that it is positioned by moving or rotating it so that it appears circular and without offset between the circles of the adjustment set. With the focus regulator of the focuser you can bring the outer edge of the secondary mirror and the matching circle to cover. Even minor deviations from the ideal position are recognised here immediately. In this way, you can bring the secondary mirror into the optimal position for pull-out, down to the millimeter. This step is only necessary once, after which you can remove the cover of the main mirror.

Aligning the secondary mirror to the main mirror
Look through the small opening of the concentrator and adjust the secondary mirror with the adjusting screws until the bright reflection of the main mirror is concentric with the circles.

Alignment of the main mirror on the optical axis
Now bring the centre marking of the main mirror through the adjustment screws on the main mirror cell exactly in the middle of the concentric circles. You will immediately see the finest deviations. Your Newtonian telescope is then perfectly adjusted.