Monday, March 10, 2014

made a Duncan mask

Noticed the last couple of times using the Celestron 8-inch that the collimation is off a tad. Remembered seeing something in the SCT Yahoo!Group about the "Duncan Method." So, out of curiousity, I made a custom mask in Visio and printed it on regular paper.

Couldn't get the 8" version to fit on a regular piece of paper. I turned it so one of the cut-out openings would bleed off the page. Easy to cut with scissors.

I look forward to giving it a try. Fan say, after selecting a bright star, to use it at 400x! And centre with a reticule eyepiece. Roger. I also want to try with the camera. That might need a 2x. If it works I'll try this with the C14...

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