Hi Greg - I use it for Differential; Photometery where limited pixel shift is desired and it works like a dream - provided you keep an eye on it. But I wouldn't recommend it for unattended photography. The software is still in a beta + stage and there is the odd occasion when it does not perform as expected. The 174 is is best guiding camera I have used - it 's red band capability lets you hang on to guide stars better, especially when there is that pesky high cloud about.
Geof
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