I have the ASI1600MM-Cooled and Orion ED80T CF, Orion EON 115mm, and Celestron Evolution 9.25" SCT (with and without f/6.3 focal reducer). How do I figure out which directories I need when it asks for narrowest and widest FOV? The download wizard asks about arcmins, etc and should be 20% of my narrowest FOV and should match (I assume) the widest FOV.
Right, so you just need to get the camera’s pixel size and the scope focal length and you have all parameters you need to calculate scale.
SGPro has a little calculator for this if you want to use it