35mm vs 120 film: formats, frame counts and scanning
35mm film usually produces a 24 × 36 mm image. 120 is roll film for medium-format cameras, with frame dimensions determined by the camera. A larger negative can retain more detail at the same print size, but usually gives fewer photographs per roll.
Updated 5 October 2026 · Analog Film Lab by Foto Americaine
How many photographs fit on a roll?
| Format | Typical exposures | Image size |
|---|---|---|
| 35mm full frame | 24 or 36 | 24 × 36 mm |
| 120, 6 × 4.5 | 15 or 16 | About 56 × 42 mm |
| 120, 6 × 6 | 12 | About 56 × 56 mm |
| 120, 6 × 7 | 10 | About 56 × 69 mm |
| 120, 6 × 9 | 8 | About 56 × 84 mm |
These are typical figures; camera, back and film can vary. Half-frame cameras use smaller images on 35mm film and typically yield about twice as many exposures.
Does 120 fit a 35mm camera?
No. Buy the film format supported by your camera. The number 120 is a format designation, not a width of 120 millimetres. Check whether an older camera instead takes 620, 127 or another format.
Why does medium format look different?
A larger negative needs less enlargement for the same print size. Grain can therefore be less noticeable and more detail can remain visible. Film, lens, focus, exposure and scanning also influence the result. A larger format does not guarantee a sharper photograph.
Is the developing process different?
Film type determines the chemistry, rather than size alone. C-41 film in 35mm and 120 uses the same type of colour process. Handling, carriers and scanning differ. Traditional black-and-white film and slide film require their appropriate processes.
Which scan resolution do I need?
Compare output pixel dimensions with your intended use. Our 35mm options are Standard at 2000 × 3000 and Premium at 4000 × 6000 pixels. Medium format uses different aspect ratios; ask about output dimensions for 6 × 6, 6 × 7 or your particular format. Do not apply a 35mm specification to every 120 frame size.
Frequently asked questions
Does 120 always cost more per photograph?
It usually provides fewer exposures. Add film, developing and your chosen scans, then divide by the number of usable images. Use current prices for your comparison.
Which format is a practical starting point?
A working 35mm camera often offers more exposures per roll and a compact kit. If you already have a medium-format camera, buy compatible 120 film and first learn its loading and winding procedure.
Related guides
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