How To Differentiate The Spotting Scope From Astronomical Telescope?
Spotting scopes are considered a more powerful upgrade from binoculars, and have been designed with 2 key distinguishing features that differentiates them from astronomical telescopes: a) A built in variable zoom eyepiece - variable zoom eyepieces allow you to zoom in and out on an image, much like you would with a camera. b) Multi-coat lenses - these coatings are for land-viewing. They boost "land colours", such as blues and greens, for a better viewing experience. If your spotting scope comes with what's called an "ED Coating", which stands for "Extra-Low Dispersion", this means that you've got an excellent scope. ED glass does away with what's called chromatic abberration - a distortion in the image when looking at very bright images, where lines are blurred with small spectrums of light. Astronomy scopes do not have coatings on their lenses - this is because they need to capture as much light as possible, and the coatings block out some light to protect your eyes during day-time viewing.
In addition, spotting scopes are more durable than astronomical telescopes. They've been designed to be portable, and hardy enough to be carried around when camping, hunting or on trips. They're also commonly waterproof and fog-proof, which adds to their rugged capability. Most spotting scopes are refractor scopes - this means that the optics have been constructed with lenses instead of mirrors, and thus resemble what most people imagine traditional telescopes look like i.e. long cylinders, with the eyepiece at the bottom of the scope.
More details about spotting scope at http://www.binosmall.com/spotting-scope.html.
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