ISO was originally designed for our project exif.co, an image embedding service. It was inspired by old cameras, specifically Leicas and Nikons, which have really warm, slightly goofy, and tactile engraved text all over.
We were also looking at film negatives for the EXIF.co brand, and started to push this into a more mechanical sans. The choice to go with a monospace was partly influenced by this, but it was also practical. We needed to calculate the length of user names in the watermark. Having a set width for all glyphs makes that much simpler.
ISO LightMechanical SLR
ISO Regularf/4.5 75–200mm
ISO BoldDorothea Lange
Detailed Specimen PDF
Production help by Leah Maldonado