To try everything Brilliant has to offer—free—for a full 30 days, visit You’ll also get 20% off an annual premium subscription. Have you ever seen a comparison of two different stacked images with different sub-exposures and was thought, "those don't look that different?" Well, they might be really different. In this video, I'll prove that sub-exposure length matters in astrophotography. The results might surprise you! Become a buymeacoffee member to help choose which products I review: Affiliate Links: Skywatcher HEQ5 Mount Skywatcher 80mm F7.5 Doublet ZWO EFW mini filter wheel Optolong LRGB Filter Set ( ") Orion Reducer USB RJ45 Cable for Controlling Mount Raspberry Pi to control mount R Pi case with touch screen ZWO Autofocuser ZWO 294MM Pro Camera: HEQ5 Mount: (mine is Orion Sirius, which is equivalent) ZWO Filter Wheel: Optolong Filters (LRGB, SII, Ha, OIII): (the Ha and OIII narrowband filters are better than what I have) Skywatcher Evostar 80mm: (equivalent lens) USB RJ45 Cable: (connects mount to laptop directly; mine is a different brand, but this should do) ZWO Autofocuser: Reducer: (mine is Orion, but this should be equivalent) Join this channel to get access to perks: This video is sponsored by Brilliant