What is MetaGuide?

MetaGuide is a video-based tool for precise collimation using the in-focus diffraction pattern of a star. MetaGuide is free, easy to use, works with any type of telescope, and most video cameras. MetaGuide has many unique features, such as realtime measurement of flexure between two telescopes.

How do you collimate Celestron SCT?

To collimate the SCT or EdgeHD, follow these steps:

1. Center the bright star in the eyepiece’s field of view.
2. Defocus the star until you can see a dark “hole” in the center (i.e. the shadow of the secondary mirror) and 2-4 diffraction rings of light around it.
3. Inspect the out-of-focus (“extra-focal”) diffraction pattern.

Do Schmidt Cassegrain telescopes need collimation?

Precise collimation is essential to good performance for any Schmidt-Cassegrain telescope. For SCTs, it’s done by small adjustments to the tilt and position of the secondary mirror in its cell.

How do you check a collimation refractor?

First, the absolute first step in checking a refractor should always be to use a known good laser collimator to ensure that the focuser is not tilted. Any mis-alignment of the focuser at all will influence every other element of collimation in a refractor.

What material is used as a collimator?

The collimator is made of perforated or folded lead and is interposed between the patient and the scintillation crystal. It allows the gamma camera to localize accurately the radionuclide in the patient’s body.

How do you collimate a Celestron SCT?

For SCTs, it’s done by small adjustments to the tilt and position of the secondary mirror in its cell. Celestron SCTs use 3 small Phillips or hex head screws for adjustment. Some optical tubes hide the screws under a cover that you can easily pry off with a fingernail.

How are the collimation screws on a Celestron telescope?

Celestron SCTs use 3 small Phillips or hex head screws for adjustment. Some optical tubes hide the screws under a cover that you can easily pry off with a fingernail. For Fastar-equipped SCTs, turn the triangular cover plate either clockwise or counterclockwise to reveal the collimation screws.

How do I collimate my Schmidt-Cassegrain telescope?

Precise collimation is essential to good performance for any Schmidt-Cassegrain telescope. For SCTs, it’s done by small adjustments to the tilt and position of the secondary mirror in its cell.

What’s the best way to collimate a telescope?

Choose only nights with superior seeing for collimation. 1. Start with a rough out-of-focus collimation. This initial step will get you in the ballpark for more accurate collimation later on. Using a medium-powered eyepiece, center a medium-brightness star in the field of view.