How do I use the Celestron Collimation Eyepiece with my 8" f/5 Newtonian?

Insert the 1.25" eyepiece into your focuser. Point the telescope at a bright surface. First, adjust your secondary mirror until the reflection of the primary mirror is centered in the crosshairs. Then, adjust the primary mirror's collimation screws until the reflection of the peephole is centered within the reflection of your primary mirror's center mark. When all reflections are concentric, you are collimated.

Is this Collimation Eyepiece better than a laser collimator?

Each tool has advantages. A Cheshire eyepiece like this one cannot go out of alignment itself, making it very reliable. It is also excellent for setting the secondary mirror position, which a single-beam laser cannot do. A laser is often faster for primary mirror alignment, but a misaligned laser can make your telescope's collimation worse. Many experienced astronomers use both: the Cheshire for the secondary and the laser for a quick primary check.

How does the Celestron Collimation Eyepiece help align a Schmidt-Cassegrain (SCT)?

For an SCT, you use this eyepiece to check the centering of the secondary mirror's reflection. While final, precise collimation of an SCT must be done on a star, this tool provides a useful daytime check to ensure the optical components are roughly aligned before you start a star test. It helps you get close, minimizing the adjustments needed at night.

Does this 1.25" Celestron Collimation Eyepiece require batteries?

No, it is a purely optical and mechanical tool. It uses ambient light, which enters through the cut-out on the side, to illuminate the internal crosshairs and your view of the mirrors. It requires no power to operate.

What will I see when looking through the Collimation Eyepiece?

You will see a series of reflections. You'll see the crosshairs of the eyepiece itself, the reflection of your secondary mirror, the reflection of the primary mirror inside the secondary, and the reflection of the eyepiece and your eye within the primary. The goal is to make all these reflections perfectly centered, like a series of nested doughnuts.

Will this Collimation Eyepiece work with my refractor telescope?

Generally, refractors do not require routine collimation by the user, and this tool is not designed for them. The Celestron Collimation Eyepiece is specifically designed for the optical systems of Newtonian reflectors and, to a lesser extent, Schmidt-Cassegrains.

IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

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Celestron Oculaire de Collimation 1.25"

par Celestron

UGC CEL-94182

$34.95 - $34.95

$34.95

$34.95 - $34.95

$34.95

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L'oculaire de collimation Celestron Cheshire est idéal pour une collimation précise des newtoniens et utile pour aligner les Schmidt-Cassegrains

Oculaire de collimation Celestron 1,25 po

L'oculaire de collimation Celestron Cheshire est idéal pour une collimation précise des newtoniens et utile pour l'alignement des Schmidt-Cassegrains. Cet oculaire spécial s'adapte aux porte-oculaires ou aux diagonales de 1¼".

L'alignement est facile grâce à la petite ouverture à une extrémité et au réticule fin à l'autre extrémité. L'oculaire de collimation est plus précis que le simple outil de collimation.

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Celestron Oculaire de Collimation 1.25"

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Oculaire de collimation Celestron 1,25 po

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