Popular searches
- High-end
- Portable
- Soulful
- Speaker
Film Digitization Magnification Guide & Calculator
Choose your sensor and film format to find a single-shot magnification that captures the entire selected area, without cutting off either edge.
1. Your camera and film
Presets are references, not exact specifications for every camera. Enter your model's actual active sensor dimensions. Do not apply a crop factor to these dimensions.
All capture presets are approximate and editable. Measure the full rectangle you want to retain. 135 with sprockets defaults to a conservative 40 x 35 mm; change 40 to 38 if appropriate. 6 x 15 varies by camera. Sheet-film image areas vary with the holder; bordered mode uses the nominal full sheet, not extra surrounding space. Add that space manually if needed.
5% reduces magnification to 95% of the maximum fit. On the limiting dimension, this leaves 2.5% of the sensor span free at each edge. This is separate from any film border already included above.
2. Suggested starting magnification
Set approximately this reproduction ratio, then confirm all four edges in live view.
Maximum complete-frame fit
Limiting dimension
Selected orientation
Sensor area used by capture
Orange: selected film capture area projected onto the sensor. Dark grey: unused sensor area. Diagram is to scale; it is not a lens image-circle test.
Maximum fit: as entered
Maximum fit: rotated 90 degrees
Complete field of view at the suggested ratio: .
This suggestion exceeds 1x. A standard 1:1 lens cannot reach this framing without additional extension or a higher-magnification lens. A lower ratio still captures the full frame, but uses less of the sensor.
How the calculation works
Magnification is the physical size of the image on the sensor divided by the size of the film being photographed. It is not a crop-factor-adjusted or “35mm-equivalent” value.
As entered: m0 = min(sensor width / capture width, sensor height / capture height)
Rotated: m90 = min(sensor width / capture height, sensor height / capture width)
Best fit: mmax = max(m0, m90)
Suggested start: m = mmax x (1 - framing allowance)
Rotated: m90 = min(sensor width / capture height, sensor height / capture width)
Best fit: mmax = max(m0, m90)
Suggested start: m = mmax x (1 - framing allowance)
The smaller ratio is essential: both dimensions must fit. A diagonal-only calculation can crop the film when its shape differs from the sensor. Best fit compares only normal 0-degree and 90-degree orientations, not diagonal placement.
Three useful examples
| Camera / capture area | Maximum fit | With 5% allowance | What limits the fit? |
|---|---|---|---|
| 36 x 24 mm sensor / 36 x 24 mm image | 1.0000x | 0.9500x | Both dimensions |
| 36 x 24 mm sensor / 40 x 35 mm with sprockets | 0.6857x | 0.6514x | 24 / 35: sensor height |
| 36 x 24 mm sensor / 56 x 56 mm 6 x 6 image | 0.4286x | 0.4071x | 24 / 56: sensor height |
From a number to a working setup
- Use a lens that can reach the suggested ratio and cover your active sensor at that ratio. The maximum fit is an upper limit for retaining the entire area, not a minimum lens capability: a lower ratio also fits, with more unused sensor space.
- Adjust camera height and focus together. Lens markings are approximate, so finish by checking the actual framing.
- The calculator describes single-shot geometry. Stitching can retain more detail from larger film, but needs a separate overlap plan; do not use this value as a stitching ratio.
- Magnification alone cannot determine stand height, working distance or optical sharpness. These depend on the lens, focusing design, mounting position and holder.