How many megapixels do you need to scan film with a camera?

The question of how megapixels relate to film grain is as old as digital photography itself. We all know the endless forum discussions about how many megapixels a good 35mm film really has and whether grain can be compared with megapixels at all. A similar question comes up when “scanning” with a digital camera. By that I mean photographing negatives to digitize them.

How many megapixels are really enough is not so easy to answer. A negative has no fixed pixel count: under a microscope you keep seeing finer and finer structures, right down to the individual grain. In practice, however, things look different, and you can safely say: 24 megapixels are more than enough for most purposes.

Still looking for the right setup of holder, light and tripod? You'll find it in our guide to scanning with a digital camera.

Contents

1. How much detail is in a negative?
2. Why 24 megapixels is a lot for 35mm and little for medium format
3. What are 24 megapixels enough for?
4. What does your camera's high-resolution mode get you?
5. How do you combine several shots into one scan?
6. What gets you more than extra megapixels?
7. Which equipment suits which goal?

1. How much detail is in a negative?

Less than the data sheets promise. Manufacturers measure their film stock on its own; in the finished negative, the lens, focusing and camera shake come into play. For handheld 35mm, 30 to 40 line pairs per millimeter is a realistic figure; from a tripod with fine-grained film, 60, and 80 at best.

Kodak specifies a resolving power of 63 line pairs per millimeter for T-MAX 100, measured on a low-contrast test target (1.6:1). The data sheet says “lines/mm”, counting each line together with its adjacent space. With a very high-contrast target (1000:1), the figure is 200. That is what it says in the 2018 data sheet. Fujifilm gives the values 80 and 160 for Velvia 50, and 60 and 200 for Acros 100 II. The lower value is closer to reality, because a fine detail in the subject rarely stands out as sharply as a black line on a white background. For many common films you won't find a figure at all anymore: the current data sheets for Tri-X 400, Portra 400, Ektar 100 and Gold 200 only show curves.

How much of this actually reaches the negative is something Erwin Puts tested with Leica lenses and many films. In his tests, the best combinations of film, lens and developer resolve 100 to 120 line pairs per millimeter, but only from a sturdy tripod, with careful focusing and on special film such as Technical Pan. With Delta 100 or T-MAX 100 and somewhat less effort, he gets 60, at best 80. Handheld at fast shutter speeds, 30 to 40 remain. With 400-speed film, longer shutter speeds and difficult conditions, it is 20 to 30 at most.

For scanning, this means: each line pair consists of a light and a dark line, and each line needs at least one pixel. That gives the lower limit shown in the table. A regular digital camera needs some headroom above that, because a color filter sits in front of each pixel and the camera calculates the missing colors from the neighboring pixels. Roger N. Clark clearly shows this difference between luminance and color resolution in his comparisons.

Well above these values, you mainly capture the grain in more detail, and hardly any more of the subject. The comparison below shows how different grain can be: one crop each from two evenly exposed 35mm negatives, one Tri-X 400, one T-MAX 100, scanned at 4,000 ppi. That is roughly the sampling a 24-megapixel camera achieves on 35mm.

Each is a 1.4 × 1.4 mm crop from the center of the frame, scanned with a Nikon Coolscan V, both with the same contrast boost so the grain becomes visible. The Tri-X shows coarser clumps, the T-MAX a finer pattern. Scans: Tri-X 400 and T-MAX 100 by Wiley.andrew.r, CC0, via Wikimedia Commons, crop and contrast by us.

Incidentally, grain that is sampled too coarsely can look larger than it is. Norman Koren calls the effect grain aliasing: the grain looks clumpier in the scan than on a print from the darkroom. But he also writes that the effect is hard to prove and tends to be rare. Usually, coarse grain in a scan is simply the grain of the film.

As a rough conversion to megapixels, Clark gives 10 to 16 megapixels for the fine-grained slide film Velvia in 35mm, and around 78 for Velvia in 6×7. He himself calls his figures rough, and they apply to one of the sharpest films there is.

2. Why 24 megapixels is a lot for 35mm and little for medium format

The camera's megapixel count says little. What matters is how many pixels fall on one millimeter of film. A 24-megapixel camera puts 167 pixels per millimeter on a 35mm negative, but only 71 on a 6×6 negative. The sensor stays the same, the negative gets bigger.

The reason lies in a single edge. All common formats on 120 film are 56 mm tall. With 6×6, 6×7 and 6×9, that is also the short edge, and when you copy the negative frame-filling, it has to cover the short side of the sensor. On a 24-megapixel camera that is 4,000 pixels, and it never gets more, even as the negative grows in width. A 6×9 negative does fill the sensor completely and gets all 24 megapixels, yet only 71 pixels land on each millimeter. With the square 6×6, a third of the sensor also stays empty, and 16 megapixels land on the negative. Only 6×4.5 fares better, because its short edge measures 42 mm, and the 56 mm lie along the long side of the sensor.

The negatives in true proportion (orange), dashed the area that a 24-megapixel camera with a 3:2 sensor captures when the negative fills it as much as possible. Below that, the megapixels that land on the negative and the pixels per millimeter of film. Our own calculation, without margins.

With more megapixels, the pixels per millimeter rise, but more slowly than the number on the camera suggests. The table shows what common sensor sizes yield on the individual formats. In practice you leave a few percent of margin, so it ends up slightly less.

A 4:3 sensor loses less when cropped to a square. A 20-megapixel camera with a 4:3 aspect ratio, such as the OM System OM-1, still fits 15 megapixels onto 6×6, putting it almost level with a 24-megapixel full-frame camera.

If you put these numbers next to the table from chapter 1, a clear picture emerges. On 35mm, even a 24-megapixel camera delivers 167 pixels per millimeter, which on paper covers even a very good negative shot from a tripod. On 6×6 to 6×9, its 71 pixels are mathematically enough for just under 36 line pairs, roughly what ends up on a handheld negative, with no reserve. You won't get everything out of a fine-grained medium format negative shot from a tripod: at 60 to 80 line pairs, you would need around 45 to 80 megapixels on a 6×6 negative.

Archives and museums apply the same yardstick to 35mm and medium format. The digitization guidelines of the US federal agencies, FADGI for short, cover negatives from 35mm up to 4×5 inches in their 2023 edition and have four levels, from 1,000 ppi up to 4,000 ppi at the highest. The levels assess more than the pixel count, such as sharpness and color, but the pixels per inch alone already show you the difference between 35mm and medium format. A 24-megapixel camera reaches a good 4,200 ppi on 35mm. On 6×6 to 6×9 it is around 1,800 ppi, just below the 2,000 ppi level. For 4,000 ppi on a 6×6 negative you would need 78 megapixels, and on 6×7 as many as 97.

In his video, Darryl Carey compared three Sony cameras with 12, 24 and 50 megapixels on 35mm and 6×4.5. For 35mm, 12 megapixels were already enough for him. For medium format, the step from 12 to 24 brought visibly more detail, while the step from 24 to 50 added only a little. His result matches the calculation, because 6×4.5 gets the most pixels per millimeter of all 120 formats, and a handheld negative contains hardly more detail than 24 megapixels capture on this format.

Video: “Do Megapixels Matter When Converting Negatives With A Digital Camera”, Darryl Carey (in English). The comparison with 100 percent crops starts at minute 7.

3. What are 24 megapixels enough for?

For almost everything you do with a scan. Instagram displays photos at a maximum width of 1,080 pixels, a 4K screen has 8.3 megapixels, and 12.6 megapixels are enough for a 30 × 30 cm print at 300 ppi. Things only get tight with large medium format prints that someone views up close.

According to its help page, the Instagram app scales down anything wider than 1,080 pixels. In 3:4 portrait format that is 1,080 × 1,440 pixels, or 1.6 megapixels. For viewing on screen, a fraction of what the camera captures is enough.

For prints, the photo service WhiteWall works with three guideline values: 300 ppi for prints and photo books you hold in your hands, 240 ppi for wall pictures and 150 ppi for large formats you view from a few meters away. A 6×6 scan from a 24-megapixel camera has 4,000 × 4,000 pixels. That gets you the following sizes:

In an Italian video, the YouTuber Domenico Pescosolido tests our 120 film holder with a Lumix S5 II, a camera with 24 megapixels. For medium format he calls this resolution “not ideal”, but says it is enough for archiving and reviewing. On his 6×9 scan you can read the time on a clock, and for a 30 × 45 cm print not a single pixel is missing. For a 60 × 90 cm wall print, that leaves around 170 ppi, less than the 240 ppi that WhiteWall specifies for wall prints.

For comparison: a lab usually delivers considerably less. In our overview of photo labs we checked at 38 labs how large the scan is in the cheapest tier for 35mm. 26 of the 38 deliver at most 6 megapixels (2,000 × 3,000 pixels), 17 of them even fewer than 4. Only two deliver more than 10. According to WhiteWall, 6 megapixels are enough for a print of about 17 × 25 cm at 300 ppi.

How many megapixels the cheapest 35mm scan tier delivers, counted across 38 labs in Germany, Austria and Switzerland. The bars show the number of labs per range. Our own analysis of the price lists, as of July to October 2026.

More pixels cost storage space. An uncompressed TIFF file with 16-bit colour depth takes up six bytes per pixel. A 6×6 scan with 16 megapixels is therefore 96 MB, one with 64 megapixels 384 MB. For a roll of twelve frames at 64 megapixels, that adds up to around 4.6 GB. A reader who works with a flatbed scanner wrote to us in August that he deliberately scans 120 at only 1,800 dpi, otherwise the files would be huge. In the Reddit forum r/AnalogCommunity a user asks who actually prints their medium format scans of 200 to 300 MB per image large.

4. What does your camera's high-resolution mode bring?

Many newer cameras shift the sensor by one pixel or fractions of a pixel between several exposures and compute a more accurate or larger image from them. Manufacturers call this pixel shift or high-resolution mode. It suits negatives well, because nothing moves on the light table. The Lumix S5 II turns 24 megapixels into 96 this way, of which 64 remain on a 6×6 negative.

There are two variants. In one, the camera shifts the sensor four times by a whole pixel. The pixel count stays the same, but each pixel measures red, green and blue itself instead of calculating the missing colours from its neighbours. Sony offers this on the α7R IV and α7R V with four exposures, Pentax on the K-1 Mark II. In the other, the camera additionally shifts by half pixels, and then the pixel count increases. This is the mode that is interesting for 120.

The Lumix S5 II that Domenico Pescosolido used for his test. Its high-resolution mode delivers 12,000 × 8,000 pixels. Photo: Henry Söderlund, CC BY 2.0, via Wikimedia Commons

The details come from the manufacturers' manuals and product pages. For negatives, you use all of these modes from a tripod or copy stand. The EOS R5 Mark II no longer has such a mode; there, Canon relies on upscaling via software. With the R5, the result only comes out as a JPEG. That is unfavourable for negatives, because you would rather calculate the inversion from a raw file.

Whether the effort is worth it depends on the film. Pushing Film tried out the mode of a Lumix S1 II, which also delivers 12,000 × 8,000 pixels, on medium format. With fine-grained slide film, it brought hardly any benefit. With Delta 3200, the grain was rendered noticeably finer; with the 400 colour negative, the gain was only visible in the 200 percent view. In this test, the mode therefore helped mainly with coarse grain. After cropping to 6×6, around 8,000 × 8,000 pixels remained. Panasonic provided the camera for the video.

Video: “Better Film Scans with Pixel Shift? | Lumix High Res Test”, Pushing Film (in English). You can see the grain comparison on Delta 3200 from minute 6 onward.

On the Photrio forum, a user shared scans of a 6×6 negative on HP5, captured with a Sony α7R IVa once normally, once from four shots and once from 16 shots. The poster saw a clear gain with 16 shots, while another user found the four-shot version sharper after downsizing to print size. You can read up on this in the Photrio thread on scanning with pixel shift.

Flickering light and vibrations quickly ruin the sequence. Panasonic writes in the S5 II manual that under LED or fluorescent light, color and brightness can fluctuate or horizontal stripes can appear. A longer shutter speed can reduce the stripes. Nikon warns that even people walking past or cars driving by disturb the sequence. The Photrio user with the 16-shot mode therefore waited until everyone in the house was asleep. Before doing a whole roll, take a test shot with your light table and look at it at 100 percent view.

5. How do you combine multiple shots into one scan?

You photograph the negative in two or three overlapping parts and let the software compute a single file from them. With a 24-megapixel camera, a 6×6 negative thus becomes around 36 megapixels from two shots. This works with any camera; all you need is time and a program that stitches panoramas.

A viewer commenting on Domenico's video describes exactly that: they shoot a 6×6 negative with a Nikon D850 in two parts and end up with roughly 8,000 × 8,000 pixels. That is as much as the high-resolution mode of the S5 II would deliver on the same negative.

Here's how to do it:

1. Rotate the camera by 90 degrees. The long side of the sensor then covers the 56 mm image height of 120 film, while the short side of a 3:2 sensor captures around 37 mm of the image width. At 24 megapixels, that's 107 pixels per millimeter instead of 71.
2. Move the negative between shots, don't touch distance or focus. For 6×4.5 and 6×6, two parts are enough; for 6×7 and 6×9, use three.
3. Overlap enough. Nate Johnson, the developer of the inversion software Negative Lab Pro, works with about 25 percent overlap for medium format and 30 for panoramic negatives from the Hasselblad XPan.
4. Set exposure manually. Auto exposure and autofocus can jump between parts, and then the seam won't match.
5. Stitch first, then invert. Lightroom uses its panorama function to merge the raw files into a new raw file (DNG). According to the Negative Lab Pro guide, you then invert this file. Johnson recommends the “Perspective” projection and advises starting with two to three parts, because each additional part makes things go wrong more often.

With the camera rotated by 90 degrees, each shot covers the full height of 120 film. For 6×6, two parts even overlap by about a third of the negative width, which is more than needed; for 6×9, you use three. Our own graphic, to scale for a camera with a 3:2 sensor.

Three Minute Pro shows what this looks like in practice with a 6×4.5 negative: four partial shots with a 16-megapixel Olympus E-M10 II, fixed at 1/2 s and f/8, stitched in Lightroom to around 52 megapixels. However, the video doesn't show a comparison with a single shot.

Video: “Digitising and stitching 120 roll film scans”, Three Minute Pro (in English, just under six minutes).

More parts don't help indefinitely. Nick LoPresti took a 4×5 negative to around 318 megapixels from 35 parts with a 24-megapixel camera. The finished file was over 200 MB, and with all the partial shots, a single image added up to over 2 GB. Lightroom and Photoshop couldn't handle the 35 parts at once, so LoPresti had to work in strips. In the video, LoPresti admits it's overkill. Johnson's advice remains more practical: two to three parts, negative flat, camera parallel. If the camera is tilted, the seam gets distorted.

6. What helps more than extra megapixels?

A flat negative, a camera positioned parallel, the right aperture and a steady shutter release. More pixels only show every flaw in these four points more clearly. That's why Peter Krogh advises checking sharpness in the center and in all four corners at several apertures before you think about a different camera.

Krogh long advocated for the highest available resolution and retracted his recommendation in 2020 in an article on PetaPixel. In his experience, most 35mm negatives don't benefit from scans above 30 to 40 megapixels. For 35mm he recommends 24 to 45 megapixels, for medium and large format more than 50. At very high resolution you have to open the aperture wider to avoid diffraction, and you lose depth of field as a result. If the film then isn't perfectly flat or the camera is tilted, the gain is gone.

These mistakes cost more sharpness than a few missing megapixels:

1. The film curls. At f/8, a 35mm negative at 1:1 magnification has only about 0.5 mm of depth of field. In our Film Flatness Test, a 35mm strip without a cover plate deviated from the plane by 0.38 mm on average, and by 0.16 to 0.20 mm in the three holders we tested (each as an RMS value across the entire area). If the film isn't flat enough, the center or corners of the image turn soft, no matter how many pixels you have.
2. The camera isn't parallel to the film. One side of the image goes soft. A spirit level isn't enough for this; aligning with a mirror on the film holder works better: if you see the lens exactly in the center of the frame, the camera is parallel.
3. The aperture is stopped down too far. At 1:1 magnification the effective f-number doubles, so f/16 becomes f/32. Diffraction blur then covers several pixels at 24 megapixels, and even more at 61 megapixels. Test your macro lens through its aperture range once. Darryl Carey works at f/5.6, Three Minute Pro at f/8.
4. The focus is off. Focus on the grain in the magnified live view, not on the edge of the frame. With the large 120 negative, the magnification is lower and the depth of field somewhat greater, but missed focus makes any scan soft.
5. The camera shakes when you release the shutter. A self-timer or remote release keeps your finger from shaking the shot, and the electronic shutter also avoids the jolt of the mechanical shutter. This matters especially in high-resolution mode, because the camera has to stay still across all the sub-exposures.
6. Light comes in from the side. Stray light reduces contrast, and a flat scan looks less sharp than it is. In r/AnalogCommunity, one user warns that bright room light shows up as uneven color in the scan, even with a strong light source behind the negative. Darkening the room or a mask around the negative helps.

How much a 35mm strip deviates from the plane in three film holders, from our Film Flatness Test. The more even the surface, the more likely the entire negative stays within the depth of field. Our own measurement.

7. Which equipment suits which goal?

For 35mm almost any camera will do, and from around 20 to 24 megapixels it also renders the grain cleanly. For medium format, 24 megapixels is enough for reviewing, archiving and wall prints up to a good 40 cm at 240 ppi. If you want to get everything out of a fine-grained 6×6 negative shot on a tripod, you'll need around 45 to 80 megapixels, correspondingly more for 6×7 and 6×9, and there are three ways to get there.

Of the three routes, a camera with more megapixels is usually the most expensive. Before you buy one, try out what your existing camera can do with high-resolution mode or stitched shots. Film holder manufacturer Valoi recommends a minimum of 8 megapixels for 35mm and 16 for medium format, and writes that capturing every last grain takes more like 20 and 50 respectively. That matches our calculation.

More important than the camera are a macro lens, a sturdy setup, an even light source and a holder that keeps the film flat. Systems for this are made by Valoi, Negative Supply and us, among others. What the individual holders can do and what they cost is covered in our film holder comparison.

Disclaimer: We sell some of the products that appear here. Even so, the article is meant first and foremost as help and not as a sales pitch.

Our sets consist of a film holder that keeps the strip flat without glass, and can be expanded with a light source, lens hood and copy stand. For 120, the basic set includes the 6×6 mask; the “All Formats” version also includes the masks for 6×4.5, 6×7 and 6×9.

If you'd rather not scan yourself at all, our lab overview lists labs with scan prices and scan sizes. For medium format, explicitly ask the lab for the pixel count of the scans, because our count above only applies to 35mm.

Read on and ask further

The most thorough piece on the question of when more megapixels stop making a difference for 35mm was written by Peter Krogh on PetaPixel. How stitching with Lightroom and Negative Lab Pro works in detail is explained in the Negative Lab Pro Lightroom guide. Alexander Seidler has published a comparison of 30, 36, 42 and 45 megapixels on medium format negatives on 35mmc. You can ask questions about your own camera in the Reddit forum r/AnalogCommunity.

How to set up the holder, light and tripod is explained in our guide to scanning with a digital camera.

Sources

• Kodak Alaris: T-MAX 100 data sheet, F-4016 (June 2018), Tri-X data sheet, F-4017 (February 2016), Portra 400, E-4050, Ektar 100, E-4046
• Fujifilm: Velvia 50 data sheet, Acros 100 II (120) data sheet
• Erwin Puts: Resolution of fine detail
• Roger N. Clark: Film versus Digital Summary (updated 2016)
• Norman Koren: Grain and sharpness in scans and enlarger prints
• FADGI: Technical Guidelines for Digitizing Cultural Heritage Materials, 3rd edition (May 2023), section 3.11
• Peter Krogh: Reaching the Megapixel Limit (for 35mm Camera Scanning), PetaPixel 2020
• Instagram: Image resolution of photos you share on Instagram
• WhiteWall: Is my photo good enough for printing?
• Camera manufacturers: Panasonic S5 II, High Resolution mode, OM System OM-1 Mark II, High Res Shot, Nikon Z f, Pixel Shift, Fujifilm X-T5, Pixel Shift Multi Shot, Sony α7R V, Pixel Shift Multi Shooting, Canon EOS R5, IBIS High Resolution
• Negative Lab Pro: Lightroom Tips, Pano Merges
• Valoi: Compatible cameras
• Videos: Darryl Carey, Pushing Film, Three Minute Pro, Nick LoPresti, Domenico Pescosolido
• Lab scans: our own analysis of the price lists of 38 labs from our lab overview, as of July to October 2026

Cover image: black-and-white negatives, a color negative strip and slides on a light box. Photo: Friedrich Haag, CC BY-SA 4.0, via Wikimedia Commons, cropped by us.