Quote:
Originally Posted by johnno07
So I'm assuming the longer the focal length of the guidescope, the better the guiding and subsequent correction - as it can correct smaller movements? Though there will obviously be a limit to how much a motor can be corrected. I will look at the QHY5 and Orion
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Focal length is not all that important. The autoguider software picks up mere brightening of adjacent pixels and interprets that as movement, and corrects for it - the software itself is VERY accurate. In my experience, what limits the accuracy of guiding is flexure between the guidescope and main OTA, weight imbalance, wind, and polar alignment error. So you want a guidescope setup that is lightweight and rigid.
As the others have said, the Orion mini AG package from Bintel fits the bill perfectly.