Adapting Old Folding and Box Cameras to Use 120 Film
Posted by John Tischler on Jul 26th 2025
There are just SO many cool folding and box cameras out there that are overlooked as shooters. Sometimes film is made for these cameras, but it is really expensive. 120 film is usually priced more reasonably, and with a little effort, and sometimes an adapter, you can put these old cameras back into service.
Adapting an old folding camera to use 120 film can be a rewarding project, but it depends on the original film format the camera was designed for. Many old folding cameras were made for now-obsolete formats (like 116, 118, 122, or 620 film), which are physically similar to 120 in terms of film width but different in spool size or image frame dimensions. Here’s a step-by-step overview on how to adapt one:
* Step 1: Identify the Original Film Format
Look for the model number, manual, or markings in the film compartment. Common formats include:
| Format | Film Width | Frame Size |
|---|---|---|
| 120 | 61mm | 6x4.5, 6x6, 6x7, 6x9 |
| 620 | 61mm | Same film, smaller spool |
| 116 | 70mm | 6.5x11cm frames |
| 122 | 70mm | 8x14cm frames |
Most adaptations are easiest with cameras originally made for 116, 616, or 620 film.
* Step 2: Modify the Spool Holders
If the camera was for 620 film:
-
120 film fits, but... the 120 spool is slightly wider and has a larger center hole.
-
Fix: Use a file or Dremel to slightly widen the film chamber or spool holder if needed.
-
Alternative: Re-roll 120 film onto 620 spools (can be done in a darkroom or changing bag).
If the camera was for 116/118/122:
-
These formats are wider than 120. You’ll need to center the 120 film in the film path.
-
Use adapters: Buy or 3D-print spool adapters that fit 120 film into the larger holders.
-
Some people use rubber grommets, foam, or plastic washers to center the spools.
-
* Step 3: Deal With Frame Size and Film Advance
Your camera may expose a larger area than 120 film covers, resulting in overlapping frames or light leaks.
Solutions:
-
Mask the film gate: Cut a black paper or matte cardboard mask to 6x9, 6x6, or 6x4.5 inside the film gate.
-
Red window frame counting:
-
Most older cameras use a red window for frame counting.
-
Use a 120 roll marked for 6x9 frames (you’ll get 8 shots).
-
If the camera exposes larger frames, you’ll need to:
-
Wind the film carefully (e.g., 1.5 turns per frame if no proper markings align).
-
Use test rolls to determine spacing.
-
-
* Step 4: Light Seals and Film Flatness
-
Use lightproof tape or felt to seal any gaps around the smaller 120 film.
-
Ensure film pressure plates hold the narrower film flat and don’t scratch it.
-
You may need to add a shim or thin felt strip behind the film.
-
* Step 5: Test with a Dummy Roll
Before using valuable film:
-
Run a backing paper (or expired film) through the camera.
-
Check film advance spacing.
-
Make sure film rolls tightly onto the take-up spool.
* Optional: Upgrade the Lens or Shutter
Old folding cameras can produce lovely images, but the shutter speeds might be slow or sticky.
-
Clean/lubricate the shutter.
-
Some people mount modern lenses/shutters if the camera body is in good shape.
* Tools & Materials Checklist
-
120 film
-
620 take-up spool (if needed)
-
Rubber grommets, washers, or spool adapters
-
Black paper or cardstock (for masks)
-
Small file or rotary tool
-
Light-sealing foam or tape
-
Dummy film or backing paper