Posted: 30 Jul 2019 03:13
A-L-E-X wrote:Source of the post Does anyone know what the minimum effective focal length needed is to show separation of Saturn from its rings in an image?
The minimum separation of Saturn's surface and the innermost ring is between 1.7 ans 2.4 arc seconds (depending on the distance to Saturn), and the horizontal resolution of your camera is 4608 pixels, so for the gap to make up one pixel, the horizontal field of view of your camera must be no more than about 2.2 - 3.1 degrees. So a 1000 mm lens (36x24 mm sensor equivalence) should suffice. When Saturn is at its closest, maybe that can be pushed down to 600 mm.