Spotting scopes are small telescopes that have been modified for use by day. A spotting scope differs from an astronomical telescope in several important ways. First, a spotting scope always produces an upright image whereas a telescope may produce a reversed image or even an upside-down image (not a problem for astronomy). Second, a spotting scope is much smaller in size than a telescope, mainly for the sake of portability. Third, a spotting scope is a lower magnification instrument than a telescope, since the atmosphere by day does not allow the high magnifications used in astronomy. Fourth, a spotting scope is mounted on an ordinary photo tripod, but a telescope for astronomy requires a particular mount, often this just isnt practical for daytime use. Lastly, many, if not most, spotting scopes are waterproof and fog proof a rare feature in an astronomical telescope.