Let’s Get Started… We get the question “how long after sunset is it dark?” a LOT. Knowing the time of darkness after sunset is important to many astronomers and astrophotographers. Unfortunately, however, it is not a straight answer for every situation; one must consider things such as latitude, season, and altitude. What is “Astrodark”? Astrodark

Magnification is used to enhance an object’s size so that it can be viewed with the human eye to assess it for a number of reasons. This could be for scientific research, geographical investigation, or purely from a visual perspective. We often get asked what the easiest way to calculate total magnification is. This article

All telescopes – and indeed, most optical devices – work by collecting light at the objective lens or primary mirror, and then converging these light rays into a spot called the focal plane. Particularly with eyepieces, it is basically inevitable that any telescope will have aberrations at the focal plane in some fashion, and they