Farpoint OTA Bahtinov Masks

Brand: Farpoint
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Farpoint OTA Bahtinov Masks

Brand: Farpoint
SKU: N/A
$35.00$69.00

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Using a Bahtinov Mask

1: Attach your camera to the telescope, center a fairly bright star in your telescope and achieve rough focus.
2: Place the Bahtinov mask over the front aperture of your telescope by “hanging” it on the three plastic lugs from the front dew shield.
3: Take a short exposure. The image of the star will show diffraction spikes (see image below).
4: The “center” set will most likely be shifted to one side or the other. This is showing the defocus.
5: Adjust the focus of your telescope and re-expose the star, once again showing the diffraction spike pattern.
6: Repeat this process until you get the central diffraction spike centered against the star and the other spikes.
7: When you achieve a symmetrical pattern, you have achieved the best possible focus. Remove the mask (which easily slips off), center your target object, and take your images!

Farpoint Bahtinov Mask - inside and outside focus position

In 2008, Pavel Bahtinov, a Russian amateur telescope maker and astronomer, published an ingenious new way to easily focus your webcam, DSLR, or CCD camera for astrophotography. The method is simple, very intuitive, and the device has universally been named after the inventor: The Bahtinov Mask. Please scroll down to the detailed product description to learn how they work.

General purpose masks are available in five different variable sizes to suit refractors and Newtonian reflectors between 2.5″ and 10.5″ diameter (measured across the OTA diameter including surrounding metal or plastic). Cassegrain masks are sized to suit popular Meade and Celestron SCT telescopes (based on the telescope mirror aperture from 6″ through to 12″). Farpoint manufactures this lifesaving astrophotography tool out of virtually indestructible ABS plastic.

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