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I have never had to go longer than 2 secs guiding exposures with the mono QHY5 on a ST80 guide scope, period. I dont know what the min mag is, who cares, it works. Beware, the colour version is less sensitive, I wouldnt bother. Get a QHY8 for imaging ;-). Just as a byline, the QHY5 starts to get marginal for guiding at 15secs or more, from experience on my automated GRAS rig, but with my home rig, it has been brilliant at 2 secs for everything.
Guiding is the single biggest influence on image quality, the mono QHY5 makes it a no brainer for most rigs, dont mess with it, set and forget. Worry about imaging seperately.
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