Start with physical evidence rather than guessing from the photographed decade.
35mm has perforated edges; 120 has no sprocket holes and can contain several frame sizes; slides may be mounted individually.
A practical method
- Measure film width without cutting it
- Check sprocket holes and frame orientation
- Read edge markings with magnification
- Keep original envelopes nearby
- Note whether images are negative or positive
- Photograph unusual formats for assessment
What to avoid
- Opening undeveloped rolls
- Cutting to fit a scanner
- Using household tape
- Assuming every small negative is 35mm
- Discarding edge information
Frequently asked questions
Is professional help necessary?
A lab can identify uncommon, damaged and discontinued formats before quoting scanning.
What should happen first?
Separate developed negatives from undeveloped film and slides.
Where can I continue?
Compare examples in the Film Formats Guide.
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