Thursday, September 8, 2011

Using The FarPoint Focus Mask

Here's a trick to get sharper photos.
This is the FarPoint Focus Mask, based on the Bahtinov design. It'll show you when you're perfectly focused. This one is sized for the Celestron 11" SCT. See how it just slips over the secondary mirror housing. Then you pick the brightest star near your area of interest. You're looking for the center pattern below. When the pattern is centered, take off the mask and shoot away.

I used Capella in Auriga for these left, center, and right patterns because it's so bright. You probably won't have such a bright star in the vicinity of what you're shooting, and you want something close by because the farther you swing the scope, the more chance that the focus will change.

Posted by Dave

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