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It looks like the William Optics finder. If it is, it is well worth getting. As far as adjustment goes, I've never done it, because (probably through luck) it came perfectly adjusted from the factory; I take it on and off my 110mm refractor and is so stable that each time I can centre an object in a sixty power eyepiece. I don't find the brightness a problem--I usually only use it in initially finding alignment stars and then using the GOTO. Also it may dim with time as the battery fades
Geoff
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