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Astronomy > Telescope accessories > Astrophotography > Masks > Focusing Masks > Astrozap > Full Aperture Focusing Screens > Astrozap Bahtinov focusing mask for apertures of 368mm-444mm
Product no.: 33696

Bahtinov focusing mask for apertures of 368mm-444mm

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Product description

The focusing mask according to Pavel Bahtinov facilitates precise focusing, which is particularly important in astrophotography. The mask is attached to the front of the tube or lens. When looking at a star, it produces a pattern of rays. When the long ray intersects the two slightly shorter rays symmetrically in the middle, the focus is correct. Thanks to its many opening slits, the Bahtinov mask can also be used with relatively dim stars. This is an advantage over the classic Scheiner mask.

A Bahtinov mask should actually be calculated separately for each aperture ratio. However, experience shows that one mask can be used very effectively for an entire aperture range.

Specifications

General


Diameter (mm)
368 - 444
Material
Aluminium
Colour
black
Series
Full Aperture Focusing Screens

Product safety

Manufacturer: Astrozap, P.O. Box 502, Ohio 44107 Lakewood, US, www.astrozap.com
Responsible person: NIMAX GmbH, Otto-Lilienthal-Str. 9, 86899 Landsberg am Lech, DE, [email protected]
Astrozap Bahtinov focusing mask for apertures of 368mm-444mm
In focus star image
Astrozap Bahtinov focusing mask for apertures of 368mm-444mm
Out of focus stellar image

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