If the film is still inside a closed cartridge or you do not know whether it was developed, do not pull it out or expose it to light. Read any outside labels and ask a film lab. These scanning devices are for film that has already been developed.
Begin with the material.
A mixed archive can include several kinds of photographs. Separate them before shopping for equipment.
- Developed negatives: individual frames on a strip of film, with reversed tones or colors. They need a film-compatible holder and a capture method that converts the negative image.
- Mounted slides: individual transparent pictures held inside cardboard or plastic mounts. The mount and the image inside it are different measurements.
- Paper prints: photographs on opaque paper. They need a photo-scanning or camera-copy workflow, rather than either film scanner compared here.
- Movie film or video: reels of sequential frames, or tapes. Transferring the moving image requires a different workflow.
Look for a format, not just a number.
35mm is also called 135. The names 110 and 126 are film-format identifiers, not widths in millimeters. Look at the image opening, the strip, and any readable labels together.
| Format | Typical image area | Clue |
|---|---|---|
| 35mm / 135 | 24 × 36 mm | A wider rectangular image. |
| 110 | 13 × 17 mm | A much smaller rectangle, sometimes in a small mount. |
| 126 | 28 × 28 mm | A square image in a larger square mount. |
Typical mounted image areas from Kodak Digitizing’s identification guide. These are not the outside dimensions of the mount or the overall width of a negative strip.
Image shape alone is not proof. Half-frame 35mm and other formats can look different from these examples. A square slide could be another format, such as 127. If the clues do not agree, keep the format marked unknown.
Measure the mount separately.
Keep the slide inside its mount and measure the outside of the cardboard or plastic. Common larger mounts are approximately 50 × 50 mm, often described as 2 × 2 inches. Some 110 slides use smaller mounts around 25 × 25 mm, often described as 1 × 1 inch.
A 110 image can also sit inside a larger mount. That is why choosing “110” in a scanner menu does not, by itself, tell you whether a mounted slide fits the holder. Thick, glass, and unusual mounts need an additional check.
The Slide N Scan documentation specifies a 50 × 50 mm holder. The SCANZA manual lists different slide trays and inserts. Confirm the correct holder for your mount size and thickness before buying; do not force the slide into a tray.
If you are still unsure, stop here.
Write down the labels you can read, the outside mount dimensions, and whether the image is square or rectangular. Ask a film lab or the equipment manufacturer to identify it. You can then return to the finder with a confirmed format.
For mixed collections, run the finder separately for each material and format. One scanner may not cover the entire box.
Sources & checks
Manufacturer documents checked October 8, 2026. Specifications may change; verify the exact model before purchase.
- Kodak Digitizing: identifying mounted slidesImage openings and the distinction between film format and mount size. This publisher also sells a digitizing service.
- Kodak: Slide N Scan format compatibilityDeveloped film types and 50 mm slide mounts.
- Slide N Scan RODFS50 user manual (PDF)English pp. 6–7: sensor and holder; pp. 8 and 12–13: developed film and loading.
- SCANZA RODFS35 user manual (PDF)Printed pp. 9–10: tray directory and slide sizes; pp. 20 and 26: interpolation and specifications.
This is document-based guidance. We have not physically tested these scanners. How we reach a recommendation.