Brand: Starfield Optics Inc

Starfield 140mm Focus Mask (FM-140)

FM-140

Brand: Starfield Optics Inc

Starfield 140mm Focus Mask (FM-140)

FM-140

$39.95 CAD

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$39.95 CAD

Easy Payment Options with .

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Product Description

The Bahtinov mask is used focus small telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov.

Simply place the mask in front of the main optic of your telescope and take a picture. Look at the diffraction spike pattern and continue until the spikes are even. Using a Bahtinov mask is the easiest way to get into focus.

This 140mm mask is great for 125mm - 130mm class telescopes
Fits dew shields with an outside diameter of 153-192mm

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