How to scan film with a camera

To scan film with a camera, you photograph each frame on an even, high-CRI light with a macro lens, with the camera sensor exactly parallel to the film. Shoot RAW at base ISO and around f/8, focus by hand on the grain, and keep one exposure and one white balance for the whole roll. Then convert the RAW files into positive photos in a conversion app.

Why scan film with a camera

A camera scan is fast. Each frame takes one exposure, so a roll goes as fast as you can move the strip through the holder.

The detail comes from your camera. At 1:1, a 35mm frame fills a full-frame sensor, so a 24-megapixel camera gives you a scan of about 6,000 × 4,000 pixels. With larger film you can shoot each frame in several tiles and stitch them for more.

You also keep control. You get RAW files and make the conversion choices yourself, instead of receiving files with the colour already decided.

The other routes have real strengths, and they are worth a fair look:

• A flatbed scanner takes 35mm, 120 and often 4x5, and it runs unattended while you do something else. Many have infrared dust removal. Epson lists its Digital ICE for colour negative, slide film (but not Kodachrome) and chromogenic black and white film. Traditional silver black and white film is not on the list.
• A lab scan costs you no gear and no time, and a good operator knows their scanner well. If you shoot a few rolls a year, a lab can be the right call.

A camera makes the most sense when you shoot a lot, want large files, or want to decide how your pictures look.

What you need

• A camera that shoots RAW. Any mirrorless camera or DSLR works. Live view with a magnified view makes focus much easier. The pixel count sets how much detail one shot can hold.
• A macro lens. A true macro lens reaches 1:1 and is sharp across a flat subject, which is what film is. Longer macro lenses give you more room between the lens and the film, so they pick up fewer reflections. Enlarging lenses on a bellows or helicoid also work, but every adapter or tube adds a chance of uneven light.
• A light source. It must be even, larger than the frame, and have a high colour rendering index (CRI). Lights made for scanning list CRI 95 or more: CineStill rates its CS-LITE at 95+, and Negative Supply lists 97 and 99 CRI models. A phone or tablet screen shows its pixels in the scan unless you diffuse it.
• A film holder. It keeps the film flat, lifts it off the light, and blocks light around the frame. Examples are the Negative Supply carriers, Valoi’s easy35 and easy120, the glassless pixl-latr (35mm, 120 and 4x5), and Nikon’s ES-2, which mounts on the front of some Nikon macro lenses.
• A copy stand or a solid tripod. It holds the camera pointing straight down, rigid enough not to shake when you press the shutter.
• Black card or tape to mask stray light, and a room you can darken.
• A remote release or the self-timer, and an air blower for dust.

How I do it. I scan on a copy stand I built from aluminum extrusions, with a Canon EOS 6D and Canon’s EF 100mm f/2.8L Macro lens. A roll takes me a few minutes to scan, and even less to convert in Monobath.

White light or narrowband light

Most scanning lights are white LED panels. A few newer ones use narrow bands of colour instead. CineStill’s CS-LITE+ is one, and CineStill says it separates the dyes of colour negative film better than white light. A good white light works for every film type and is the simple place to start. Some white lights also have modes for each film type: the CS-LITE has a cool setting for colour negative, white for black and white, and warm for E-6 slides.

Magnification for each format

Magnification is the size of the picture on the sensor divided by its size on the film. To fill the frame, match the short side of the film frame to the short side of your sensor (24 mm on a full-frame camera), then check that the long side fits too.

Format	Nominal frame	Magnification on a full-frame sensor
35mm	36 × 24 mm	1:1 (1x)
6x4.5	6 × 4.5 cm	about 0.55x
6x6, 6x7, 6x9	6 × 6 to 6 × 9 cm	about 0.4x
4x5	4 × 5 in	about 0.23x in one shot

The real image area on 120 film is a little smaller than the format name, so measure one of your frames with a ruler and do the sum yourself. On an APS-C camera, divide the numbers by your crop factor: a 35mm frame then needs about 0.65x. Leave a thin border of film around the frame so nothing gets cut off. You crop later.

Lower magnification puts the lens farther from the film, so check that your stand’s column is tall enough. For 120 and 4x5 you can also go closer and shoot the frame in tiles. The guides on scanning 120 film and scanning 4x5 sheet film cover both ways.

Align the camera with the film

If the sensor tilts in relation to the film, one side of the frame goes soft and the rectangle turns into a trapezoid. A smaller aperture hides a small tilt, but not a large one. Get the camera parallel once, then leave the stand alone for the whole session.

A bubble level on the light and another on the back of the camera gets you close. The mirror trick gets you much closer.

The mirror trick

1. Put a small flat mirror where the film goes, on the holder or on the light.
2. Look through the viewfinder or at live view, and turn on the grid or a centre focus point.
3. Find the reflection of your lens in the mirror. Adjust the camera until the reflection sits exactly in the centre of the frame.
4. Lock the stand, remove the mirror, and put the holder back without moving the light.

If the light or the holder moves on the table, do it again. It takes a minute.

Mask the stray light

Light that goes around the film and into the lens scatters inside it and fogs the whole capture. After conversion, that fog shows up as a flat, grey picture with weak contrast. Mask the light around the holder with black card, cover any open gaps, and turn off the room lights so nothing reflects off the shiny side of the film.

Focus the lens

• Focus by hand on the grain. Zoom live view to its largest magnification and turn the focus ring until the grain is crisp. Black and white grain is sharp and easy to see. In colour film you see soft dye clouds; focus until they look their crispest.
• Autofocus can work. Nikon’s own guide to digitizing film says it works in most cases. Manual focus does not hunt on low-contrast frames, and it stays put from one frame to the next.
• Start at f/8. It limits vignetting, which would otherwise show at the edges after conversion. It also gives you some depth of field for film that is not perfectly flat. Do not stop down much further: at 1:1 the light reaching the sensor already behaves like an aperture about two stops smaller than the one you set, and very small apertures soften the image through diffraction.
• Check focus on every strip. Curl changes from strip to strip and moves the film.
• Do not shake the camera. Use the self-timer or a remote, and the electronic first-curtain or electronic shutter if your camera has one.

Set the exposure

The full method is in the guide to exposure and white balance for film scans. The short version:

• Shoot RAW, in manual mode, at your camera’s base ISO.
• Use a fixed white balance (daylight, or a custom one measured off the bare light), never auto.
• Set the shutter speed so the brightest part of the film sits close to the right edge of the RGB histogram without touching it. On a negative, that is the clear film between the frames. On a slide, it is the clearest highlight.
• Keep the same settings for the whole roll, so every frame starts from the same place.

A roll workflow

1. Clean the strip. Hold it by the edges and blow the dust off both sides.
2. Load it base side up. Put the shiny base side toward the camera, so the picture reads the right way round. If you load it the other way, flip the image later.
3. Frame the first picture. Leave a thin border of film base around the frame.
4. Focus and set the exposure on this frame, then lock both.
5. Shoot. Use the self-timer or a remote.
6. Advance to the next frame and place it where the last one was, so every capture has a similar crop.
7. Check focus at the start of each new strip.
8. Check for dust on the first frame at 100%. A minute with the blower now saves an hour of spotting later.
9. Copy the RAW files into one folder per roll, with the roll’s name or number and the date.
10. Back the folder up before you convert anything.

Common problems

• One side of the frame is soft. The camera is not parallel to the film, or the film curls. Redo the mirror trick, and see how to flatten curly film.
• Rainbow rings in the picture. The film touches glass. Read about Newton rings and how to stop them.
• Specks and hairs. On a negative, dust turns into white specks after conversion. Clean before you shoot, and see dust on film scans.
• The conversion looks flat and grey. Stray light, or an underexposed capture. Mask the light and check why film scans look flat.
• The colour changes from frame to frame. Auto white balance, or room light that mixes with the scanning light. Fix the white balance and see colour casts in film scans.
• Dark corners or bands across the frame. The light is too small or uneven for the frame, or the lens is wide open. Use a bigger light and stop down to f/8.

What to do next

Your RAW files are still negatives. To turn them into photos, follow the guide to converting film negatives.

For other film, read the guides to scanning slides with a camera and scanning film with an iPhone when you do not have a camera at hand.

Sources

• Nikon: digitizing film using the D850 and ES-2
• Nikon: Film Digitising Adapter ES-2
• CineStill: CS-LITE camera scanning light
• CineStill: CS-LITE+ SpectraCOLOR
• Negative Supply: light sources
• Valoi: easy120
• pixl-latr
• Epson: Digital ICE specifications for film
• Hasselblad: medium format photography for beginners