I love these barn-door tracker builds. I did one myself and did some fun high school math along the way to do tangent corrections in software. Fun times. [1]<p>[1] <a href="https://partofthething.com/thoughts/making-a-cheap-and-simple-barn-door-star-tracker-with-software-tangent-correction-for-astrophotography/" rel="nofollow">https://partofthething.com/thoughts/making-a-cheap-and-simpl...</a>
I am not an astrophotography guy, and I have not built a barndoor tracker (yet), so take this with a grain of salt, but I'll skip right to the double-arm type here if ever get around to it:<p><a href="https://www.pentaxforums.com/articles/photo-articles/astrophotography-part-3-barn-door-tracker.html" rel="nofollow">https://www.pentaxforums.com/articles/photo-articles/astroph...</a>