Brand: Starfield Optics Inc

Starfield 200mm Focus Mask

FM-200

Brand: Starfield Optics Inc

Starfield 200mm Focus Mask

FM-200

$37.00 USD

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$37.00 USD

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What is a Reservation?
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Product Description

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

The  Bahtinov mask  is used focus sma 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 200mm mask is great 8" SCT or RC telescopes   (Celestron C8's and EDGE HD800)

Fits dew shields with an outside diameter of 212-252mm

 

Customer Reviews

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D
D.V.B.
Starfield (Orion) Focus Mask

This mask arrived in an Orion box with Orion instructions, which was fine. I actually like it a bit better than the Starfield mask I previously had, as the protective brown paper is only stuck on one side of the mask, leaving the other side black plastic. I choose to have the brown paper side facing out, as it is more visible and I am less likely to forget to take the mask off! The mask fits my Vixen 8” f/4 Newtonian (R200ss) well.

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