Mark yes there are lots of factors which cause bloated stars. However the KAF8300 chip has small pixels which causes over sampling and this commonly (all other things being equal) causes bloated stars. DSLRS also have small pixels too and this also leads to bloated stars. Most of the images taken so far have been with camera's with small pixels. Stuart being the exception at present with the ST10
If the optics are inferior then all the stars will have a bloated appearance not just the brighter ones Mark.
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