Optical Finders

Optical Finders

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Optical finder scopes are essentially small, low power refractors, and are the most common and popular type of finder available.  Some models do illuminate and include reticle eyepieces to make object centering easier.  In most cases, a finder is not brand specific to the telescope so if you see a finder with features you like from one company and own a telescope from another- you'll simply need the right bracket to make the two mate. 

There are two basic types of optical finder, not defined by their aperture.  A right-angle finderscope is just what the name implies. It has its own "built-in" angle that allows the user to view through a diagonal - a feature handy if the telescope is pointed at or near the zenith or if the finder will be mounted too close to the optical tube to allow straight through viewing. The image is erect, meaning it is the same orientation as a star chart.  The other type is known as a straight-through finder.   These finders will leave the view upside down and backwards, just like your standard telescope set up.