Takahashi collimation eyepiece without a lens, with a 31.75 mm thread. Center mark and side opening for illuminating the reflective surface.
CHF 42.75incl. Swiss VAT
Reference TKA00441
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The Takahashi collimation eyepiece fits into the 31.75 mm slip-on eyepiece holder. It has no lens and features a small central hole that positions the eye on the optical axis. The reflections from the optical surfaces then serve as reference points for checking the geometric alignment of the mirrors.
A side opening illuminates a reflective, metallized surface. The procedure is typically performed during the day or at dusk; at night, the manufacturer recommends illuminating the instrument’s entrance and/or this surface. The accessory is not intended to be used as a standalone light source.
This tool is used for collimating Newtonian telescopes—particularly those mounted on Dobsonian mounts—and for adjusting the secondary mirror on Cassegrain and Ritchey-Chrétien telescopes. The Takahashi model is machined from aluminum and manufactured in Japan. Follow the procedure appropriate for your instrument before making any adjustments.
| Features | Value |
|---|---|
| Reference | TKA00441 |
| Mechanical Input Interfaces | 1.25" (31.75 mm) male fitting |
| Dimensions | Height: 45 mm. Diameter: 35 mm |
| Weight | 45 g |
TKA00441 collimation eyepiece only. The TKA00442 collimation tube and any light source are not included in the package.
Reference: TKA00441. Takahashi's Official Profile.
