Astronomy
Optics calculators
The arithmetic, done for you, with the working shown.
Optics calculators
The arithmetic, done for you, with the working shown.
““The box says 675× magnification. What will this telescope actually show me, and which eyepiece should I use for what?””
Telescope & eyepiece calculator
““What is this actually going to cost me in the first year, including the things nobody mentions?””
Hobby startup cost estimator
““Will the Andromeda Galaxy fit in my frame with this telescope, and are my camera’s pixels the right size for it?””
Field of view and image scale calculator
““These two pairs are the same price. Which is better for what I do?””
Binocular specification comparison