I’m a stickler for detail and love to add exif metadata for my film cameras to my scanned images. These are my notes to self about the data I use most often. I only wish exif had fields to record the film details too.
See the ExifTool site for download and general-purpose instructions. At some point I consulted this discussion. And though it has nothing to do with camera and lens data, I also often reference these geotagging docs.
Hasselblad 500 EL/M with 150mm lens
exiftool \
-Make='Hasselblad' \
-Model='ELM' \
-Lens='Zeiss Sonnar 150mm ƒ4' \
-LensModel='Zeiss Sonnar 150mm ƒ4' \
-LensInfo='150mm f/4' \
-FocalLength='150mm' \
-FieldOfView='21.1 deg' \
-ApertureValue='4.0' \
-FNumber='4.0' \
-ExposureTime='1/25' \
-ISO='100' \
filename.png
Hasselblad 500 EL/M with 80mm lens
exiftool \
-Make='Hasselblad' \
-Model='ELM' \
-Lens='Zeiss Planar 80mm ƒ2.8' \
-LensModel='Zeiss Planar 80mm ƒ2.8' \
-LensInfo='80mm f/2.8' \
-FocalLength='80mm' \
-FieldOfView='38.6 deg' \
-ApertureValue='4.0' \
-FNumber='4.0' \
-ExposureTime='1/25' \
-ISO='100' \
filename.png
Hasselblad 500 EL/M with 50mm lens
exiftool \
-Make='Hasselblad' \
-Model='ELM' \
-Lens='Zeiss Distagon 50mm ƒ4.0' \
-LensModel='Zeiss Distagon 50mm ƒ4.0' \
-LensInfo='50mm f/4.0' \
-FocalLength='50mm' \
-FieldOfView='76.8 deg' \
-ApertureValue='8.0' \
-FNumber='8.0' \
-ExposureTime='1/250' \
-ISO='400' \
filename.png
Hasselblad 500 EL/M with 40mm lens
exiftool \
-Make='Hasselblad' \
-Model='ELM' \
-Lens='Zeiss Distagon 40mm ƒ4.0' \
-LensModel='Zeiss Distagon 40mm ƒ4.0' \
-LensInfo='40mm f/4.0' \
-FocalLength='40mm' \
-FieldOfView='89.4 deg' \
-ApertureValue='8.0' \
-FNumber='8.0' \
-ExposureTime='1/60' \
-ISO='800' \
filename.png
Olympus Stylus Epic 35mm point-n-shoot with integrated 35mm lens
exiftool \
-Make='Olympus' \
-Model='Stylus Epic' \
-Lens='Olympus Lens 35mm ƒ2.8' \
-LensModel='Olympus Lens 35mm ƒ2.8' \
-LensInfo='35mm f/2.8' \
-FocalLength='35mm' \
-FieldOfView='63.4 deg' \
-ApertureValue='8.0' \
-FNumber='8.0' \
-ExposureTime='1/60' \
-ISO='400' \
filename.png
4x5 Crown Graphic with 135mm lens
exiftool \
-Make='Crown' \
-Model='Graphic' \
-Lens='Nikon Nikkor-W 135mm ƒ5.6' \
-LensModel='Nikon Nikkor-W 135mm ƒ5.6' \
-LensInfo='135mm f/5.6' \
-FocalLength='135mm' \
-FieldOfView='50.4 deg' \
-ApertureValue='22' \
-FNumber='22' \
-ExposureTime='1/25' \
-ISO='100' \
filename.jpg
4x5 Crown Graphic with 88.9mm lens
exiftool \
-Make='Crown' \
-Model='Graphic' \
-Lens='Wollensak Alphax 3½" (88.9mm) ƒ12.5' \
-LensModel='Wollensak Alphax 3½" (88.9mm) ƒ12.5' \
-LensInfo='88.9mm f/12.5' \
-FocalLength='88.9mm' \
-FieldOfView='71 deg' \
-ApertureValue='22' \
-FNumber='22' \
-ExposureTime='1/25' \
-ISO='100' \
filename.jpg
I used this calculator for field of view details.