Which type of optical telescope is the most power-full?
NEVER EVER buy a telescope from Walmart, Costco, Target or any of that type of store! I would like to suggest that you join a local astronomy club or astronomical society BEFORE you spend your money on a scope. There are many different kinds of scopes and what is perfect for one person is not perfect for another. Everyone has their own set of eyeballs and no two are the same. If you join a club, you can attend a few of their star parties and try out members scopes to see what works best for YOU, before you buy a scope. The members can also help you when you get your scope and show you how to get the most out of your new scope as well as to help teach you where the treasures in the sky are located. Most clubs have loaner scopes and extensive libraries that you can gather more information from too. Most clubs will have monthly membership meetings with informative presentations given by members and by guest speakers. You can really learn a lot from these clubs and an added plus is all the
