APT - Astro Photography Tool. v3.88. released on 2021/05/06 next version in August 2021 - beta available. APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions. No matter what you are imaging with - Canon EOS, Nikon, CCD or CMOS astro camera, APT has the right tool for planning, collimating.