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It projects a small red dot onto a clear screen at the front of the finder. They have a variable brightness control and limited up/down right/left adjustment. Okay for rough alignment on bright objects. I've since retired mine in favour of a couple of right angled finderscopes, as my aging eyes need a bit of magnification. Find they are inclined to wash out dimmer objects as I could never get the brightness low enough. The Telrad seems to be a better option, although I've only used one once some time back.
Bill
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