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35mm film developing
and format guide

35mm, also sold as 135 film, is the format we develop more of than any other. Color (C-41), black & white, and slide (E-6) rolls are developed and scanned in-house, uploaded to your free web gallery, and your negatives are mailed back.

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Develop + scan from $14 Scans online 2–4 days after we receive your film
135 film cassettes ready to be mailed to The Darkroom for developing We processC-41 · B&W · E-6 Quality developingSince 1976

Is this your film?

Most film cameras made since the 1930s take 35mm. Here’s how to be sure that’s what you’re holding.

A 135 film cassette with its leader out, next to a developed strip of 35mm negatives
  • Small metal cassette about an inch across, with a short tongue of film (the leader) poking out of a felt-lined slot. After the last frame, the film rewinds back inside.
  • Sprocket holes along both edges of the film. Each picture is 24 x 36mm, with frame numbers printed along the edge of the negatives.
  • “135 film” or “35mm” on the box, with 12, 24 or 36 exposures. Cassettes made since 1983 carry a silver-and-black checkerboard DX code.
  • Common cameras: nearly every SLR and point-and-shoot, from the Canon AE-1, Pentax K1000 and Nikon FM to the Olympus Stylus, plus disposable cameras and today’s Kodak Ektar H35 half-frame.

Developing 35mm film at The Darkroom

135 film is the film we run most, on dedicated C-41 machines and our dip-and-dunk line for everything else. Here’s what we process, what you get back, and what to check before you mail it.

What we process

  • Color print 35mm film (C-41): Kodak Gold, Ultramax, Portra, Fujifilm, CineStill and every other brand
  • True black & white 35mm film: Ilford HP5, Kodak Tri-X and T-Max, Fomapan and more
  • C-41 black & white film such as Ilford XP2
  • Slide 35mm film (E-6): Ektachrome, Velvia, Provia and other E-6 films
  • Half-frame, panoramic, redscale and cross-processed rolls
  • Old and expired 35mm film of any brand

What you get back

  • Developing, with your negatives cut, sleeved and mailed back (or left uncut if you ask)
  • Scans uploaded to your free online gallery, with an email the moment they land
  • Standard, Enhanced, or Super scans. Enhanced is our recommendation for most rolls
  • Every frame color, contrast and density adjusted, or left uncorrected if you prefer
  • Optional 4×6 or 5×7 color prints, or true B&W prints
  • Optional scans on a USB drive

Before you send it

  • Pre-1973 color film marked C-22 or Kodacolor-X uses a chemistry no longer available. We can develop it as black & white instead. We cannot process Kodachrome (its K-14 chemistry ended in 2010), Triple Print or E-4 Ektachrome at all.
  • Leave the film in its cassette. If the leader is wound all the way in, that’s fine; we retrieve it in the dark.
  • Shot half-frame or panoramic? Pick that option at checkout so the frames are scanned the right way.
  • Old film often comes back with color shifts, fading, or grain. That’s the film, not the lab, and the images are usually still worth it.

The Original Mail-In Film Lab

Since 1976
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A Darkroom employee in white gloves checks a strip of negatives beside a Noritsu HS-1800 film scanner Satisfaction guaranteed, since 1976

35mm film developing prices

One price per roll of 135 film, with the add-ons you choose at checkout. No hidden fees.

Develop + Standard scansPer 35mm roll · negatives returned · free web gallery $14
Add-ons per roll
Enhanced scans Our recommended size+ $2
Super scans Largest files, best for enlargements+ $6
Color 4×6 prints+ $10 per set
Color 5×7 prints+ $18 per set
True black & white 4×6 prints On real silver gelatin paper+ $20 per set
Slide film (E-6)+ $6
Half-frame format Scanned 1-up or 2-up+ $6
Panoramic format+ $10
Push or pull processing+ $3
Cross processing+ $3
Redscale film+ $3
Do not cut negatives+ $3
Other options
Develop only, no scans Add $6 for E-6, $3 for push, pull or cross processing$11
E-6 slide mounting Develop-only orders, 35mm only+ $15
Disposable camera Develop + Standard scans, any brand$17
Inbound shipping Printable label or free postage-paid mailerFree
Return shipping Unlimited rolls per order$6.95
Prices shown are current as of this page’s last update. The checkout always shows the final price before you pay.

How 35mm developing by mail works

  1. 1

    Order online

    Pick 35mm as your film type, choose your scan size and any prints, and check out. One order can hold as many rolls as you have, and disposable cameras can ride along.

  2. 2

    Mail it in

    Print your free shipping label, or request a postage-paid mailer and we’ll send one to you. Drop the cassettes in as they are and send it.

  3. 3

    Get your photos

    We email you the moment your scans land in your online gallery, usually 2–4 days after your film arrives. Share, download, or order prints. Your negatives and any prints follow in the mail.

35mm film questions

About 135 film

Movie film that became 135 film, the world’s standard still format. Part of our guide to popular film formats.

135 film at a glance

Also called
35mm film, 135 film, 135-24 / 135-36
Introduced
1889 as movie film; 1934 in the Kodak 135 cassette
Film width
35mm, perforated along both edges
Image size
24 x 36mm (half-frame 18 x 24mm)
Loading
Metal cassette with a leader; rewinds when done
Exposures
12, 24 or 36 per roll
Processes
C-41 color, black & white, E-6 slide
Still made by
Kodak, Ilford, Fujifilm, CineStill, Lomography and others

History

The 35mm film format was developed and produced at an experimental scale in Thomas Edison’s laboratory by splitting 70mm roll film. Edison filed his caveat for the double-perforated cine film in the fall of 1889, describing it as a long band passing from one reel to another, driven by two sprocket wheels.

Cine film was cheap, and unused short ends were soon available for small cameras that were easy to carry compared with the large-format plate cameras of the day. The earliest emulsions were fine-grained and slow, but as studios began filming indoors they demanded faster stock at the expense of grain, which ironically made it less suited to still cameras once those became widely available. The first design was patented as early as 1908, but the 1913 Tourist Multiple is generally accepted as the first commercially available 35mm camera, built for both movie and still photography, soon followed by the Simplex, which could switch between full and half frame. Oskar Barnack built his prototype Ur-Leica in 1913 and patented it, but Ernst Leitz did not put it into production until 1924.

The 135 film cassette

Early 35mm cameras had to be loaded in the dark from bulk film. Kodak changed that in 1934 with the 135 daylight cassette, launched alongside its Retina camera: a light-tight metal canister with a felt-lined slot and a short leader you could thread onto the take-up spool in daylight. The standard 135 frame is 24 x 36mm, twice the size of a cine frame, and cassettes hold enough film for 12, 24 or 36 pictures. From 1983 a DX code on the cassette let cameras read the film speed automatically. The 135 format became by far the most widely used photographic film format until the arrival of the digital camera.

35mm film cassettes next to a strip of 135 film
135 cassettes and a strip of 35mm film. The 24 x 36mm frame has been the standard since 1934.

35mm film dimensions

The strip of 135 film is 35mm wide, just under 1.4 inches, with a row of sprocket holes along each edge, eight per frame. The picture area is 24 x 36mm, close to 1 x 1.4 inches, and the frames sit a few millimeters apart along the strip. A 36-exposure roll is about 1.6 meters (5.3 feet) long. Half-frame cameras divide each frame into two 18 x 24mm pictures, and panoramic cameras stretch it to 24 x 65mm. For comparison, a 110 negative is 13 x 17mm, and a 120 medium format frame is 60mm wide.

Half-frame 35mm

A half-frame camera splits each 24 x 36mm frame down the middle and shoots two upright 18 x 24mm pictures in its place. A 36-exposure roll becomes 72 photos, which is a big part of why the format has taken off again: the Olympus Pen cameras of the 1960s are back in demand, Kodak’s Ektar H35 made half-frame cheap and simple, and Pentax built its first new film camera in decades, the Pentax 17, around it. The pictures are smaller and a little grainier than full-frame 35mm, in the same way 110 is, and the two-up pairs are a look of their own.

Half-frame rolls take the same developing as any other 35mm film. Scanning is where they differ: there are twice as many pictures on the roll, so we add $6 per roll for half-frame scanning. Choose the half-frame option at checkout and tell us how you want the frames scanned:

1-upOne image per picture

Every half-frame is scanned on its own. A 36-exposure roll gives you 72 upright images.

4 pictures, 4 separate files

2-upTwo pictures per image

Each pair is scanned together as one full 35mm frame, side by side. A 36-exposure roll gives you 36 images, each holding two pictures.

4 pictures, 2 paired files

Not sure which to pick? 1-up is the choice if you want each photo on its own for printing and sharing. 2-up keeps the pairs together, which is how many half-frame shooters plan their shots, and gives you the diptych look straight out of the scanner.

Slide film in 35mm

The E-6 process is the chromogenic process for developing Kodak Ektachrome, Fujifilm Fujichrome Velvia, Fujifilm Fujichrome Provia, InfraChrome Color Infrared and other color reversal (slide) films. Instead of a negative, you get a positive transparency you can project, mount, or scan. Read more about E-6 film types and attributes.

Cinema film in still cameras

CineStill 50Daylight and 800Tungsten color negative films bring the story full circle: they are motion-picture stock prepared and packaged for 35mm still cameras, developed in standard C-41. They have a very distinctive look and are meant for very different scenes. 50D is a daylight film with very fine grain, and 800T is tungsten-balanced and performs well in low light. See CineStill 50Daylight and 800Tungsten example images and film attributes.

CineStill 50Daylight and 800Tungsten 35mm film boxes
CineStill 50Daylight and 800Tungsten, cinema stock repackaged for 35mm still cameras.

35mm film today

35mm never went away. Kodak, Ilford, Fujifilm, CineStill, Lomography and a long list of smaller brands still make fresh color, black & white and slide film in 135 film cassettes, new cameras like the Kodak Ektar H35 are being made for it, and every disposable camera on a drugstore shelf has a roll of it inside. It remains the most-shot film format in the world, and the one we develop more of than any other.

Sources: Camerapedia, Kodak product histories.

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Ready to see what’s on that roll?

35mm developing from$14
  • Developing + negatives returned
  • Free digital web gallery
  • Standard, Enhanced & Super scans
  • Optional true photographic prints
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