The clear night sky under a new moon is almost always the same brightness in the same location. I have blindly put my camera on ISO 6400 as a result. But after having read somewhere that Sony supposedly builds sensors that are ISO invariant, I wanted to test this claim with my own Sony-equipped Nikon D750. The Nikon D750 is already my favorite camera to date for landscape astrophotography (I like to call them nightscapes). A full-frame DSLR that sports a tilting screen? Check. Large enough pixels (photosites) that help gather enough light? Check.
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Peter Zelinka ISO Invariance with a Nikon D750
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