I think the orion is the same?. Its cheap, mono, easy to fit, reasonable (ample) res, drivers for everything, adjustable gain, locally available and has an ST4 guide socket, all thats required. Not particularly low noise, but low enough for less than 5 sec exposures at least. I dont know of any other guide cam with these features for the price (given there are many other brands that are just clones of each other).
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