Manufacturer: -TS Zubehör
Product number: HSZONTC12

EUR 499,00


incl. 19 % VAT (DE)  
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TS-Optics ONTC Primary Mirror Cell for Newtonian mirrors from 300 mm to 315 mm diameter
A homogenous and stable support of the mirror is absolutely essential for getting good imaging results with a Newtonian telescope. ONTC Newtonian telescopes by TS-Optics belong to the very best of their class, not least because of their high quality mirror cell.

Now we want to also offer these cells to amateurs and telescope builders for their own projects.

These are the features of our ONTC Primary Mirror Cells:
The computer-optimized triangles, as part of the mirror support, are mounted movably.
This results in equal weight distribution across the 9 points.
The holding jaws for the mirror have grooves and elongated holes, permitting an optimal fit of your mirror.
The mirror rests firmly on top of the 9 points and is held in place by lateral cork plates. Thereby, good temperature compensation is achieved.
The cell is colored in matt black.
Collimation is done without tools using grippy, spring-loaded tommy screws.
The collimation fixation is achieved by small counter screws, which are fastened manually.

Article:ONTC Newtonian Primary Mirror Cell
Suitable for:All Newtonian mirrors with 300 mm to 315 mm diameter
Possible mirror thickness:32 - 43 mm
Internal tube diameter:For tubes with 344mm internal diameter
Installation:Through M8 counter screws from the exterior
Mirror support:Computer-optimized 9-point-support
TS Optics ONTC Primary Mirror Cell

Locking the primary mirror into position
In rare cases the primary mirror can be able to move in the cell when tilting the telescope tube. This happens because the brackets holding the mirror shouldn´t apply pressure to the mirror, resulting in too much clearance in certain circumstances.

But this does not mean that the mirror cell is defective and you have to send it back, you just have to readjust the brackets. Here is how to to that:

1. Take the primary mirror cell out of the tube by removing the three rear radial screws
2. Slightly loosen the screws marked with "B".
3. Slightly loosen the screws marked with "A" and gently push the bracket against the mirror. It should only touch the mirror side, no pressure must be applied. Then, tighten the "A" screws again.
4. Same for the "B" screws: The brackets should only touch the mirror rim with their own weight. Then, tighten them.

Two hints: It may be useful to place a piece of paper between the mirror and the cork pads. Pull it out after the screws have been tightened and no stress should be applied to the mirror substrate.
If the mirror moves sidewards by a small amount, this has no effect on the image quality. But it should not tilt due to a up-and-down movement.

If this is done, the mirror should not move anymore but it should be possible to rotate it in its cell. Re-adjust if necessary. Then, the cell with the mirror can be installed in the tube and adjust the main mirror with the rear collimation screws.


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