Adam; it took me a while to appreciate the improvement in the light passing through the Bahtinov mask (I like that name) as compared to a Hartman. I also ran into the problem of the classic Hartman loosing sensitivity near the focus and I've been using one of the "+" designs that provides information all the way through the region of best focus like the Bahtinov mask, but it only works well on bright reference stars.
One question about the Bahtinov mask; is it alignment sensitive? In other words, must it be accurately centered to work well? The reason I ask is centering a mask is easy unless you're using a dew shield on a Cat, then it can get tricky.
This looks like a neat design and I'm looking forward to trying it.
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Re: Revolutionary new way of focusing! No less!
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