Because it has
61Mpx, a
reasonable price (much lower than A7R IV, Z7 II or R5, if purchased without the EVF) and it has
ISO6, which can be used on a tripod.
When setting ISO6 the camera is likely to capture 16 shots at ISO100 (lowest genuine native ISO) in a row and average them, producing a single output RAW file. Electronic shutter should avoid any vibrations between shots keeping sharpness intact. So in essence we have a software 4-stops ND filter, but additionally averaging 16 shots means reducing noise to 1/4, or equivalently gain 2 full stops of Dynamic Range. This probably makes this camera at ISO6 be the highest DR camera in the market, making HDR bracketing (with all its drawbacks) more unnecesary than ever.
I have done a test with my Sony A7 II by averaging in the Bayer domain (I used
Anton Wolf's DNG stacker for this) 16 shots taken at ISO100 over this ETTR'ed high DR scene (12 stops):
(I was surprised my camera produced some visible blooming on the chair)
http://guillermoluijk.com/misc/iso6escena.jpgRAW histogram in stops:
http://guillermoluijk.com/misc/iso6hist.gifISO100 vs software ISO6 100% crop comparison (used ACR to develop the DNG files, no NR nor sharpness applied):
http://guillermoluijk.com/misc/iso6.jpgAn invisible hair on the chair in the single shots, becomes visible in the stacked image.
Want to play with the DNG files:
Regards