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Howie Glatter with the Tublug fitting is absolutely the simplest and best around i reckon. Cat's eye also good but for ease of use and accuracy and the ability to collimate on your own Howie glatter is Definately the way to go without a doubt, i have a two inch barlowed Howie glatter and tublug and my 12'' reflector has incredibly accurate collimation so quickly and simply.
Regards
Shane
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