I finally got around to testing the 10" Bahtinov mask I made over the Christmas break and I must say I'm pretty happy with it. Here's a couple of images of the mask in action last night (same image just two different length exposures).
Interesting Peter - the second image (shorter exposure) looks like it's out of focus because because the centre spike is closer to the bottom set than the top. The longer exposure shows proper focus. It pays to perform proper exposure to get correct results.
