The focal length of the mirror for example if a mirror had a 50 inch focal length is divided by the focal length of the eyepiece. For example a 1 inch focal length eyepiece. 50/1 would be 50 power. If the focal length of the mirror was 50 inches and the eyepiece 1/2 inch, 50/.5 would equal 100 power.
Eyepieces and focal lengths are not usually referred to in "inches" but millimeters. For example a 1300mm primary focal length and a 20mm eyepiece.
Apologies for some of the wind noise. I forgot to use my wind sock mic.
There is one minor technical flaw in her comments. The cone of light doesn't come to a point at the secondary mirror but rather will be almost as wide as the secondary small mirror near the eyepiece. The point of light, or focal length is actually outside where your eye would be. The eyepiece focal length does determine how much magnification exists. So most of her comments are correct.
where is this? US or Australia?
ama00010 11 months ago
Further comments about magnification.
The focal length of the mirror for example if a mirror had a 50 inch focal length is divided by the focal length of the eyepiece. For example a 1 inch focal length eyepiece. 50/1 would be 50 power. If the focal length of the mirror was 50 inches and the eyepiece 1/2 inch, 50/.5 would equal 100 power.
Eyepieces and focal lengths are not usually referred to in "inches" but millimeters. For example a 1300mm primary focal length and a 20mm eyepiece.
firecatgreg 2 years ago
Apologies for some of the wind noise. I forgot to use my wind sock mic.
There is one minor technical flaw in her comments. The cone of light doesn't come to a point at the secondary mirror but rather will be almost as wide as the secondary small mirror near the eyepiece. The point of light, or focal length is actually outside where your eye would be. The eyepiece focal length does determine how much magnification exists. So most of her comments are correct.
firecatgreg 2 years ago