Here's an example: A 6-inch telescope has a focal length of 36 inches. To find the f/ratio, divide 36 by 6. This produces f/6. Often, the aperture is in inches, but the focal length is given in ...

Turning to the heavens, [Alex] took a look at the most interesting objects you can see with a 6-inch telescope. Images of the moon turned out rather well, with beautiful 2-bit dithering along the ...