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I have a tracker and use it often and normally set lens fully open, but in this case my aim was just make a scenic picture in the twilight for which I squeezed the aperture and used only 6 seconds.
The other images are made in the dark with full aperture also intended as a scenic picture. However many scenic pictures show more difference between the faint and the bright stars.
Indeed small stars are better but because of the low bit depth of current displays (8 bits vs 12-14 bits of the human eye viewing the sky) brighter stars are displayed larger on many scenic sky images.
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