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Update: after stacking the exposures the colorful artifacts are back.

This is from a very long exposure, 3550 seconds (10-24mm @10mm, f11, ISO 200). I didn't do dark frame subtraction but had Noise Reduction turned on. I did another long exposure of about 210 30-second exposures (10-24mm @10mm, f4, ISO 800) and am working on processing those (Noise Reduction turned off). First appearances show that there are much less artifacts, tho a few are there. Much easier to fix. What is your favorite way to process star trails? I'm currently toying with StarStax The wavy line is someone walking in front of the camera with a headlamp. Enlargement of one of the newer exposures below. This is just mountain, no stars.

I did a long exposure last weekend for star trails and while it looks nice I cannot use it because it is full of these colorful artifacts. On different long exposures they appear in similar areas. They also appear on my X-T1 sometimes. I have had the sensor cleaned for dust at a camera shop on both cameras.

A couple of pictures from the flood cleanup in Baton Rouge last weekend. X-Pro2, 18-135mm @56mm, f5, 1/150, ISO 500 X-Pro2, 18-135mm @41mm, f4.5, 1/160, ISO 400, Cactus flash off-camera

Bags: Lowepro Flipside 400AW or a F-Stop Gear ICU inside a larger climbing backpack. The usual contents: 2-3 Sandisk SD Cards 4-6 Fuji Batteries Cactus flash + V6 transceiver + spare AA batteries (rechargeable) Color gels for flash 3 filters (in a holder) Several cloths hidden in all of the nooks and crannies Large rocket blower Peak Design SlideLITE Camera Strap (usually detached) XT-1 12mm Rokinon 23mm 50-140mm Up to 2 tripods The usual leftovers: 18-135mm 60mm EF42