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Farpoint Bahtinov Focus mask, FP412H - fits Celestron 11" SCT with Fastar or Hyperstar. | Fast Easy Focus for Your astrophotos a lifesaving Tool for Focusing Your Astro Camera or DSLR.

Product ID: B014GAR7VO Condition: New

$ 91

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Delivery: 10-20 working days

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Product Description

Farpoint Bahtinov Focus mask, FP412H - fits Celestron 11" SCT with Fastar or Hyperstar. | Fast Easy Focus for Your astrophotos a lifesaving Tool for Focusing Your Astro Camera or DSLR.

Farpoint Focus Mask - 11 SCT (Hyperstar/Fastar) fits Fastar/Hyperstar READY C11 SCT's. It does NOT fit with the Hyperstar or Fastar camera installed.
Bahtinov focus masks make focusing for astrophotography fast and easy. Ends the pain of struggling to find the best focus for your astrophotography images.
Works with all electronic imaging devices. Includes DSLR cameras, modified DSLR cameras, CCD astro-imagers, CMOS astro-images, video cameras, low light systems etc.
Use by simply placing the Bahtinov focus mask over the end of your telescope, record a quick image of a bright star, adjust focus and repeat two or three times until perfect focus is achieved.
Made in the USA by Farpoint Astro. Made in America, by Americans, using American made materials and suppliers, supporting our economy. Buy American please.

Attach your camera to the telescope, center a fairly bright star in your telescope and achieve a rough focus. Then place the mask over the front aperture of your telescope. Take a short exposure. The image of the star will show diffraction spikes. The "center" set will most likely be shifted to one side or the other. This is showing the defocus. Adjust the focus of your telescope and re-expose the star, once again showing the diffraction spike pattern. Iterate the process until you get the central diffraction spike centered against the star and the other spikes. When you achieve a symmetrical pattern, you have achieved the best possible focus. Remove the mask, center your target object and take your images!