Quote:
Originally Posted by Paul Haese
Using the ST-I with an OAG on a system at 580mm at f5.6. I think that is somewhere around 1.89" per pixel or close to that. The later figure is the scale of the QSI/ TSA with reducer.
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Hi Paul,
That OAG is working at 2.7"/pixel (206*7.4/580), so the guiding RMS is about 0.3", which is ok but nothing spectacular. However the seeing might actually be very good since at that short focal length the centroid precision is limited to around 0.3ish arcsec (1/10th of a pixel), so the guider noise you are recording could be really just centroid noise, you can't really tell. Of course it's academic for the main image which is also at ~ 2"/pix.
Best
EB