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I shoot at 16mm and with a 1 second delay between shots (30 seconds long). I have a battery grip to change out batteries during shooting since the cold will drain them pretty quick. I use my camera bag to weigh down my tripod for extra stability. I opened them all in Adobe Camera RAW and applied the same WB and adjustments to each for consistency. I then stack in StarStaX. I made up my own technique for smoothing the stars because I still did have gaps (see previous post with my first pass photo). Basically, I have the stack up opened in Photoshop and duplicate the layer 20-30 times. I then apply a mild radial blur to each layer with a slightly different center. The reason you can’t just do one radial blur is the circle that the stars make is not perfectly circular (see the top right corner). I then use Photoshop’s “Auto-Blend Layers” with the “Stack” option. This function basically will take the sharpest part of each layer and blend them (which in this case, will be the section of stars where the radial blur blurs the least or where it uses the correct “center.”). I use the merged image as the star trails. I then process my foreground separately with averaging and apply over the stars.