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Hartmann Mask

How to make and use a Hartmann Mask for quick and easy focusing

Aug 20, 2017 by Tim Trott 3 Comments
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The Hartmann mask and Scheiner Disk are simple devices for making focusing a lens easier. They require that you target is a point of light, such as a star or distant planet, therefore are no good for day-to-day use.

A Scheiner Disk is a mask with two holes, whereas a Hartman mask has many holes (typically three).

The mask is like a lens cap with holes in. The holes are positioned in such a way that when out of focus, they cause multiple diffraction images as shown in the first image. As the lens is focused they merge into a single point, and then beyond focus, they separate again.

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