How Roll codes are generated & what they mean

Roll codes are the earliest bit of logic that lead to building Cassette Nest. They follow this pattern:

format-type-sequence

The main gist of it is that every roll you ever load into a camera will have a unique code per year. The purpose of this is to have a unique identifier for every roll in your collection. Write this number on your sleeve of negatives and you'll never forget the details for a roll!

Every time you load a roll of film into a camera in Cassette Nest, the roll code will be generated for you.

What does it all mean? A code made up of 3 pieces:

1. Format
   • 35mm
   • 120/medium format
2. Type
   • Black & White
   • C41 (standard color negatives)
   • E6 (slides/color reversal)
3. Sequence Number
   • Incremented for each combination of format + type within a given year.

Some examples:

• A roll with the code “35-c41-11” would be the 11th roll of 35mm color negative film in a given year.
• A roll with the code “120-e6-3” would be the 3rd roll of medium format color slide film in a given year.