General instructions on how to shoot black and white images in-camera for some popular camera models. Keep in mind that specific models and menu layouts may vary, so it's always a good idea to refer to your camera's user manual for precise instructions.

1. Canon EOS 5D Mark IV:Press the "Menu" button.
   Navigate to the "Picture Style" option.
   Choose the "Monochrome" Picture Style.
   

2. Nikon D850:Press the "Menu" button.
   Go to the "Shooting Menu."
   Select "Set Picture Control."
   Choose "Monochrome" as the Picture Control.
   

3. Sony Alpha a7 III:Press the "Menu" button.
   Navigate to the "Camera" settings.
   Select "Creative Style."
   Choose "Black & White."
   

4. Fujifilm X-T4:Press the "Menu" button.
   Go to the "Film Simulation" option.
   Choose "Monochrome" or another black and white simulation.
   

5. Panasonic Lumix GH5:Press the "Menu" button.
   Navigate to the "Photo Style" option.
   Choose "Monochrome."
   

Please note that the steps mentioned above are general guidelines, and the exact process might differ slightly based on firmware updates or model variations. Always refer to the user manual of your specific camera model for the most accurate information.