Astrophotography Showdown: Sony A7 IV vs Canon EOS Ra vs Nikon D810A – Which Captures the Cosmos Best?
The Sony A7 IV uses a 33MP back-illuminated CMOS sensor with ~5.12µm pixels and delivers unusually clean high-ISO performance, with ISO 12,800 showing little noise and star-eater largely mitigated. The Canon EOS Ra modifies its infrared-cut filter to pass roughly four times as much hydrogen-alpha light, offers 30× magnification live view for precise focusing, and provides base ISO 100–40,000 (expandable to 102,400). The Nikon D810A is built around a 36.3MP sensor with a specially tuned IR-cut that passes four times more Hα light, removes the optical low-pass filter for maximum sharpness, and has a base ISO of 200 with superb
