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I've got an unmodified a7s. It's low noise up to ISO6400, reasonable up to 56000 and tops out at 409600 (yes that is four hundred and ninety six thousand) which lets you shoot handheld in almost complete dark and is excellent for frame-and-focus.
I've got a mate who has a modified one. I can ask him what mods his has.
Rod, the mate doesn't use darks. He is an experienced astrophotographer and reckons the a7s doesn't need them at 6400.
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