Because of the inversion, that is the opposite side (or direction) for that position.Ĥ. Find which of the 8 is the worst, and change the focus until it is good in that position, noting which focus direction improved it. Then move the scope to place that star into the 8 other positions (four corners, top, bottom, left and right).ģ. Use an artificial star, 10 meters away, and get the best possible focus on center.Ģ. Assuming your scope is collimated, that is a real or artificial star forms concentric diffraction rings at intra or extra-focus, then you only need to adjust the tilt plate*.Ģ. I believe it is now outperforming its $748 price tag.ġ. I deliberately used an open star cluster (NGC 7789) in a rich star field, as this is the acid test for any scope. The scope is incredibly sharp, and has excellent color correction, but flatness of field did not start off well. It is better now.Īn image summary of the collimating process, along with final uncropped images, can be found here: This is the third RedCat from William Optics, and though much better than the first two, it still had a non-flat field. I have about 100 hours into collimating and aligning my RedCat 51 using a custom made artificial star.
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