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A few years ago I read an artice/watched a video on Spectral Instruments camera that was so sensitive and noise free it could image stars during the daylight (the faint exposure sitting a marginal fraction above the sky exposure somehow being sensitive enough to separate them).
Well I thought if thats actually true, other cameras should be capable of that if you stack enough images.
Tried with 83 images with a cropped section of the sky from my A7s at ISO 100 stacked with median method in PS, stretched contrast out.
Failed, but did get something interesting, the shape of the lens aperture is littered randomly all over the image.
