Nikon Z9 ‘Dual-Stream’ Tech Records and Displays Images with No Lag | PetaPixel

The Dual-stream technology is part of Nikon’s technology for what it bills as a “real-live” viewfinder experience in the Z9. The company says that the tech is only made possible thanks to the combination of the newly-developed stacked CMOS sensor and the EXPEED 7 image-processing engine, which allows photos to be displayed on the electronic viewfinder or LCD monitor (whichever is being used to monitor capture) as well as record that still-image data to a memory card at the exact same time.