The Hasselblad H6D-400C MS is 400 Megapixel Multi-Shot medium format camera, but it does not mean it has a 400MP image sensor. The H6D is a 100MP camera which clicks multiple images and combines them resulting in a single 400MP image.
A few years ago, Hasselblad had announced a similar 200MP Multi-Shot medium format camera named H5D. That was a 50MP camera which captured multiple images and merged them to produce a 200MP single image.
Hasselblad’s Multi-Shot technology in the H6D medium format camera is simple, it captures four 100MP images by shifting the sensor by one pixel. Then it captures two more shots by shifting the sensor by half a pixel. Now by combining all these six images, the resulting image is a single 400MP (23200 x 17400 pixel) 16-bit TIFF file. The file size of this massive 400MP image is whooping 2.4GB. But, while shooting in Multi-Shot mode, the camera needs to be tethered to a computer as the files are too large.
As the sensor is moving in order to capture multiple shots, it is bound to take more time as compared to a single shot. This is the reason that it is recommended that you shoot still subjects or make sure your camera is stable while shooting in this mode.
Talking about the price tag of the Hasselblad H6D-400C MS, it will be launched in March 2018 at $47,995.