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Post Info TOPIC: Bahtinov mask


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Hartmann mask
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Hartmann mask (sometimes called a Hartmann hat) is a tool to help focusing telescopes, mainly used by amateur astronomers.
Every part of a mirror or lens produces the same image as the whole optical element. The light is focused in the focal point. The light rays, however, go through different points of a plane before or behind the focus.
This phenomenon can be used when focusing a telescope. The Hartmann mask is a simple opaque mask containing two or three holes. (This device is called a Hartmann mask if it has multiple holes, or a Scheiner disk if it has two holes.) The mask covers the aperture of the telescope.

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RE: Bahtinov mask
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Review Of the Star Sharp Bahtinov Mask

Review of the Star Sharp Bahtinov Mask, in this video we show the mask in use as viewed through a webcam.



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bahtinov.gif
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Bahtinov mask focus
 
Focusing my telescope using a Bahtinov mask.  This is a very sensitive focusing system.  You can tell perfect focus when the middle diffraction line is perfectly centred.  It is about 1/8th turn of the focus knob from one extreme to the other demonstrating how sensitive this method is.


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A Bahtinov mask is a telescope focusing aid for astrophotography.
 The device consists of a disk made of opaque material with slots cut out in a specific pattern that is fitted into the light path of a telescope. The focusing mask uses the optics diffraction spike pattern to aid in focusing.
The mask was invented by Russian astronomer Pavel Bahtinov.

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