Dunk and Marc - it seems there is a difference of opinion over what microlensing actually is.
I always thought it was precisely what we see above - a reflection of the microlens array from the back of the sensor window on particularly bright stars (Alnitak being notorious). Also, Marc - I can't see anything particularly wrong with the image you posted - where is the microlensing you refer to in that image?
Sorry for being a dunce - maybe I've misunderstood this all along?
Cheers
Markus
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