ZWO ASI2600MC PRO is it worth it ? in Discussions - Cameras Posted January 30 17 minutes ago, Simon Pepper said: Thanks Nikolas. Perhaps I look at the 071 instead. Hi Simon the ZWO-071 is an APS-C size sensor with a pixel size of 4.78u, coupled with the Redcat 51 it will give you an image scale of 3.9 arc/sec per pixel. I have found an image scale of 1-2 arc/sec per pixel better suits U.K. skies.