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By binning the pixels say 2 x 2 you end up with a 3.75 x 2 = 7.5micon pixel which is much more sensitive. Allows you to better match the guide focal lengths/ plate scale and guide on even fainter star images.
The original (and best!) ST4 - which was used at Siding Spring and other observatories had 13.75 x 16 micron pixels!
The Lodestar guider for comparison has 8.2 x 8.4 micron pixels and the original QHY5, 5.2 micron pixels.
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