Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
eyepiece_calc
astronomical optics, part 3: the astronomical image
When building a refracting telescope, does the diameter of the eyepiece matter? And why do we need to move the eyepiece (as in my textbook) if the image is always focused at
Eyepiece - Wikipedia
Equipment - Telescope - Eyepieces
Confused by maximum FOV calculations, field stop, vignetting - Eyepieces - Cloudy Nights