How to Load 120 Film Without Losing Frames

by Marius Constantin June 26, 2026

Loading 120 film is one of those small rituals that makes medium format photography so satisfying, but it can feel slightly mysterious the first few times you do it. Unlike 35mm film, 120 film is not housed in a light-tight cassette. It is rolled around a spool with a length of opaque backing paper, and the camera relies on that paper, the film path, the take-up spool and either a red window or a frame counter to position each exposure correctly.

If you are learning how to load film into a camera, 120 roll film is a little less forgiving than 35mm. A loose roll, an incorrectly placed start arrow, a missing take-up spool or a pressure plate set to the wrong format can all cost you frames. The good news is that once you understand what each part is doing, loading 120 film becomes calm, repeatable and reliable.

This guide explains how to load 120 film into a medium format camera without wasting the first frame, overlapping exposures or fogging the roll. It is written for photographers using classic roll-film cameras, including folders, TLRs, SLRs and rangefinder-style medium format cameras.

If you are choosing a camera to practise with, you can browse our 120 film and medium format film cameras, including classic folding cameras, Mamiya cameras and Rollei cameras.

What Makes 120 Film Different?

120 film is roll film. It has a strip of photographic film attached to a longer strip of backing paper. The backing paper protects the film from light and carries printed numbers and markings used by many older cameras to show which frame you are on.

A roll of 120 film does not have sprocket holes like 35mm film. Instead, the camera advances the film by winding it from the supply spool onto an empty take-up spool. This means tension, spool position and correct alignment matter more than they do with most 35mm cameras.

Depending on the camera format, a standard roll of 120 film usually gives:

8 exposures on 6x9 cameras
10 exposures on 6x7 cameras
12 exposures on 6x6 cameras
15 or 16 exposures on 6x4.5 cameras

Some cameras shoot panoramic or unusual formats, so always check the specific model if you are unsure.

Before You Start: Know Your Camera Type

The exact loading method varies from camera to camera, but most 120 film cameras fall into one of these groups.

Red window cameras

Many older folding cameras and simple box cameras use a small red window on the back of the camera. You wind the film until the correct frame number appears in the window. The red window is safe because the backing paper protects the film, although it is still wise not to leave bright sunlight shining directly into it for long periods.

Red window cameras often have no mechanical frame counter. The backing paper numbers are the frame counter.

Automatic counter cameras

More advanced cameras, such as many TLRs, SLRs and professional medium format cameras, use an automatic frame counter. You align the film’s start arrows with a mark inside the camera, close the back, then wind until the camera stops at frame 1.

With these cameras, the start mark is important. If you wind too far before closing the back, you may lose the first frame. If you stop too early, the first frame may be partly on the taped leader rather than fully on film.

Interchangeable-back cameras

Some medium format systems, such as certain Mamiya models, use removable film backs or inserts. These usually have a take-up spool on one side and the fresh roll on the other, with a clearly marked start point. The principle is the same, but the loading takes place in the insert rather than directly inside the camera body.

Parts You Need to Identify Before Loading 120 Film

Before putting a new roll in the camera, take a moment to identify the key parts. This helps prevent the most common loading mistakes.

The supply spool

This is the new roll of film. It normally goes into the lower or left-hand chamber, depending on the camera design. The paper leader should pull across the film gate towards the take-up spool.

The take-up spool

This is the empty spool that receives the film as you wind on. 120 cameras need an empty spool inside the camera before loading. After you finish a roll, the old supply spool becomes your next take-up spool.

If you buy a vintage camera and it does not have an empty spool, you will need one before you can load film properly.

The backing paper

The backing paper is the black or dark-coloured paper wrapped around the film. It protects the film from light and carries printed arrows, dots, frame numbers and warning markings.

When loading, you initially handle the backing paper only. The actual film starts further into the roll, after the paper leader.

The start arrows

Most 120 film has a pair of start arrows printed on the backing paper. On cameras with automatic counters, these arrows must be aligned with the camera’s start mark before closing the back.

On many red window cameras, you do not use the start arrows in the same way. Instead, you close the back after attaching the paper to the take-up spool, then wind until frame number 1 appears in the red window.

The film gate

The film gate is the rectangular opening behind the lens where each exposure is made. The film must lie flat across this area.

The pressure plate

The pressure plate holds the film flat against the film plane. On some cameras, especially those that can accept both 120 and 220 film, the pressure plate can be moved or rotated. If it is set incorrectly, the film may not sit at the correct distance from the lens, resulting in poor focus or winding issues.

How to Load 120 Film Into a Camera: General Method

The following method applies to many 120 film cameras, but always adapt it to your camera’s specific design. If the camera has printed loading instructions inside the back, follow those first.

1. Load in subdued light

You do not need a darkroom to load 120 film, but avoid direct sun. A shaded room, your own shadow outdoors or the inside of a camera bag is better than standing in bright light.

The backing paper protects the film, but the edges of the roll can still be vulnerable if the roll is loose or handled roughly. Subdued light gives you a safety margin.

2. Open the camera back

Open the back carefully and check inside before loading. Look for dust, old film scraps, loose backing paper, deteriorating seals or corrosion around the spool chambers.

If the camera has been stored for years, gently clean away dust with a blower. Do not touch the shutter curtains, bellows interior or pressure plate with anything abrasive.

3. Move the empty spool to the take-up side

In a 120 camera, the empty spool belongs on the take-up side. If there is an empty spool in the supply side from the last roll, move it across.

The take-up spool must engage properly with the winding key or gear. If it is not seated correctly, it may turn unevenly or fail to wind the film at all.

4. Insert the fresh roll in the supply chamber

Place the new roll in the supply side with the backing paper facing the correct direction. In most cameras, the paper leader should pull from the outside of the roll and travel across the film gate with the black side facing the lens side of the camera.

Do not break the paper seal until the roll is in your hand and ready to load. Once the seal is removed, keep gentle tension on the roll so it does not loosen.

5. Pull the paper leader across the film gate

Draw the backing paper smoothly across the film gate towards the take-up spool. Keep it straight and flat. The paper should not twist, buckle or pass under parts it should go over.

Many cameras have rollers or guide rails. The paper must follow the intended path around these guides. If the paper is routed incorrectly, the frame spacing may be wrong or the film may not lie flat.

6. Thread the leader into the take-up spool

Insert the narrow end of the backing paper into the slot on the take-up spool. Push it far enough through that it will grip when wound.

Turn the winding knob or lever slowly until the paper wraps around the take-up spool at least once. Watch that it winds straight. If the paper starts walking towards one flange of the spool, stop and correct it before continuing.

7. Keep tension on the roll

As you wind the paper onto the take-up spool, hold the supply roll lightly with a finger to keep the backing paper taut. Do not pull hard. You only need enough tension to stop slack loops forming.

Loose loading is one of the easiest ways to lose frames. Slack film can create uneven spacing, light leaks at the edges of the roll or a loosely wound finished roll.

8. Align the start arrows or use the red window method

This is where camera type matters most.

For automatic counter cameras, wind until the start arrows on the backing paper line up with the start mark inside the camera. The mark may be a dot, line, triangle or coloured indicator near the film gate. Once aligned, close the back and wind to frame 1.

For red window cameras, you usually do not stop at the start arrows. Instead, once the backing paper is secured and winding evenly, close the back and continue winding while watching the red window. Stop when the number 1 appears in the correct window for your format.

Some cameras have multiple red windows for different formats. Make sure you are using the correct window for the frame size your camera shoots.

9. Close the camera back securely

Before closing the back, check that the film is straight, the spools are seated and the pressure plate is in position. Close the back firmly and make sure the latch is fully locked.

On folding cameras, be careful not to press or twist the bellows while loading. On cameras with removable backs, confirm the insert is properly locked into the shell before attaching it to the camera body.

10. Advance to frame 1

After the back is closed, wind to the first frame.

On an automatic counter camera, wind until the frame counter reaches 1 or the advance mechanism stops. Do not keep forcing the lever beyond its stop.

On a red window camera, wind slowly until frame number 1 appears clearly in the window. Stop with the number centred. If the camera has a window cover, close it after setting the frame.

How to Load 120 Film in a Red Window Camera

Red window cameras are common among vintage folding cameras. They are simple and reliable, but the photographer is responsible for advancing the film correctly.

Open the back and place the empty spool on the take-up side.
Place the fresh roll in the supply side.
Pull the backing paper across to the take-up spool.
Thread the paper leader into the spool slot.
Wind until the paper is firmly attached and moving straight.
Close the back.
Open or uncover the red window if the camera has a sliding cover.
Wind slowly until the number 1 appears.
Stop with the number centred in the window.
After each exposure, wind to the next number.

Red window cameras may show different rows of numbers on the backing paper. The correct row depends on format. For example, a 6x9 camera uses the 8-exposure numbering, while a 6x6 camera uses the 12-exposure numbering. Most modern 120 backing paper is printed with number sets for common formats, but the position of the red window determines which one you see.

If you are using an older camera and cannot see the number clearly, do not wind quickly. Watch for the warning dots or markings before the number appears, then slow down. It is very easy to overshoot a frame if you are distracted.

How to Load 120 Film in an Automatic Counter Camera

Automatic counter cameras are usually faster to use once loaded, but they depend on correct starting alignment.

Open the camera back or remove the film insert.
Move an empty spool to the take-up side.
Insert the fresh roll in the supply side.
Pull the paper leader across the film gate.
Thread it into the take-up spool.
Wind slowly until the paper is tight and straight.
Continue until the start arrows align exactly with the camera’s start mark.
Close the back securely.
Wind on until the counter reaches frame 1.
Make the first exposure only once the camera indicates it is ready.

Do not guess the start position. If the start arrows are well beyond the mark before you close the back, the first frame may be wasted. If the arrows stop too early, the camera may begin counting before the film is fully in place.

Spool Orientation: Which Way Should the Film Roll Face?

Spool orientation causes many 120 loading errors. The correct direction is the one that lets the backing paper travel smoothly from the supply roll, across the film gate and onto the take-up spool without twisting.

As a general rule, the black backing paper should face inward towards the lens and film gate as it crosses the camera. The printed side may face the camera back, especially in red window cameras so the frame numbers can be read through the window.

If the film seems to be pulling from the wrong side of the roll, stop and check before going further. Never force the roll to follow a path that feels awkward. Medium format cameras were designed with a clear film route, and the leader should naturally reach the take-up spool when placed correctly.

Understanding Backing Paper and Start Arrows

The backing paper does several jobs. It protects the film from light, provides enough leader to load in daylight, gives printed frame numbers for red window cameras and supplies start arrows for automatic counter cameras.

The beginning of a 120 roll is only paper. The actual film is attached further along. This is why you can safely pull out the leader and thread it into the take-up spool in subdued light.

On automatic counter cameras, the start arrows tell the camera where the film is in relation to the first exposure. When you align the arrows with the start mark, the camera is ready to wind the correct distance to frame 1 after the back is closed.

On red window cameras, the printed frame numbers on the backing paper are used instead. You wind until the number appears in the window. The start arrows may pass by before the back is closed or before the first frame is reached, depending on the design.

Pressure Plates and 120 Film Flatness

The pressure plate is easy to overlook, but it is important. Medium format negatives are larger than 35mm negatives, so film flatness has a visible effect on sharpness. If the film bows or sits at the wrong depth, your photographs may look soft even when the lens and focus are correct.

Check that the pressure plate is clean, smooth and properly seated. Some cameras have a pressure plate that slides or rotates between 120 and 220 settings. 220 film had no backing paper along the full length of the roll, so the pressure plate position is different.

If you are using 120 film, the pressure plate must be set to 120. If it is left on 220, focus and winding can be affected.

How to Avoid Losing the First Frame

Losing the first frame is one of the most common frustrations when learning how to use a film camera with 120 roll film. The cause is usually one of the following:

The start arrows were wound past the camera’s start mark before closing the back.
The back was closed too early and the camera began counting before the film was positioned correctly.
The take-up spool slipped because the paper leader was not inserted far enough.
The wrong loading mark was used inside the camera.
The camera’s counter was not reset before loading.

To avoid this, wind slowly during loading and watch the paper closely. Make sure the leader is firmly gripped by the take-up spool before aligning the arrows. If your camera has an automatic counter, close the back only when the arrows are exactly at the start mark.

If you are using a red window camera, do not stop at the start arrows unless the manual specifically tells you to. Keep winding after closing the back until number 1 appears in the window.

How to Avoid Overlapping Frames

Overlapping frames happen when the film does not advance far enough between exposures. This can be caused by mechanical problems, but it can also be caused by loading errors.

To reduce the risk:

Keep the backing paper tight while loading.
Make sure the take-up spool is engaged with the winding mechanism.
Use the correct frame number window on red window cameras.
Advance fully until the next frame number or counter stop is reached.
Do not wind backwards unless the camera manual specifically allows it.

On red window cameras, always wind to the next full frame number, not just to the next dot or warning mark. On automatic cameras, complete the full wind stroke if the mechanism is designed that way.

How to Avoid Wide Gaps Between Frames

Large gaps between frames reduce the number of usable exposures on a roll. They may be caused by overshooting frame numbers in a red window, misaligning start arrows or using the wrong format setting.

If your camera has adjustable format masks, check that the counter or red window corresponds to the format you are actually shooting. A camera set up for 6x9 spacing will not give the correct number of frames if you are expecting 6x6 spacing.

With red window cameras, wind slowly as each number approaches. Backing paper often shows dots, arrows or small warning marks before the main frame number. These are your cue to slow down.

Common 120 Film Loading Mistakes

Forgetting the empty take-up spool

A 120 camera cannot load correctly without an empty spool. If you finish a roll, keep the empty spool from the supply side. Move it to the take-up side next time.

Loading the roll backwards

If the backing paper pulls the wrong way or the printed numbers face the wrong side in a red window camera, the roll may be reversed. Remove it before going further and reload it correctly in subdued light.

Not threading the leader deeply enough

If the paper leader is barely caught in the take-up spool, it can slip when winding. Insert it firmly into the slot and wind until it wraps around the spool.

Letting the roll loosen

A loose roll can allow light to creep in at the edges. Keep gentle tension on the supply roll while loading and seal the exposed roll tightly after shooting.

Aligning the wrong mark

Some cameras have more than one mark inside the film chamber, especially if they accept different formats or backs. Use the correct start mark for 120 film and your chosen format.

Using the wrong red window

Cameras with multiple formats may have more than one red window. If you use the wrong one, your spacing may be incorrect. Check the markings around the window or the camera’s instructions.

Leaving the red window open in strong light

Many red window cameras have a sliding cover. Close it between advances, particularly in bright conditions. Modern film is generally well protected by backing paper, but caution is sensible with vintage cameras.

Setting the pressure plate incorrectly

If your camera has 120 and 220 pressure plate settings, confirm it is set to 120 before loading. This is an easy detail to miss.

Opening the back before the roll is finished

Once loaded, do not open the back until the entire roll has been wound onto the take-up spool. Opening the back mid-roll will fog the film.

After the Last Frame: Unloading 120 Film Safely

Once you have exposed the last frame, the roll is not ready to remove immediately. You must continue winding until all the film and backing paper are fully wound onto the take-up spool.

After the final exposure, keep winding until you feel the tension change or the paper comes fully onto the take-up spool.
Some cameras will wind freely once the roll is finished; others may show an end mark or allow several more turns.
Open the back in subdued light.
Remove the exposed roll while keeping it tight.
Use the paper seal to secure the roll immediately.
Move the empty spool from the supply side to the take-up side, ready for your next roll.

Do not allow the exposed roll to unravel. The backing paper protects the film, but a loose roll can still suffer from light leaks along the edges.

Troubleshooting: What Went Wrong?

The first frame is blank

A blank first frame may mean the film had not reached the film gate when the first exposure was made. This can happen if the start arrows were not aligned correctly or if the camera counter was not reset.

The first frame is partly cut off

This often means the film was advanced too far before frame 1. On automatic counter cameras, check that you are aligning the arrows with the correct start mark and closing the back at the right time.

Frames overlap

Check that the take-up spool is engaged, the backing paper was loaded tightly and the camera is advancing properly. If the camera is old, the winding mechanism may need servicing.

There are light leaks along the edges

Edge fogging can come from loose rolls, poor sealing after unloading or worn camera seals. Keep rolls tight and inspect the camera back and spool chambers for gaps.

The negatives are soft despite careful focusing

Check the pressure plate and film path. If the film is not held flat, medium format negatives can show uneven sharpness. Also confirm that the camera’s focusing system is accurate, particularly on folding cameras with old bellows or coupled rangefinders.

The frame numbers are hard to see through the red window

Use subdued light and wind slowly. If the red window is very dark or cloudy, it may need cleaning, but avoid damaging it. Some modern backing papers have lighter or smaller printing than older films, so patience helps.

Tips for Loading Different Types of 120 Film Cameras

Folding cameras

Folding cameras are compact, elegant and often use red window advance. When loading, keep the camera back fully open and make sure the film follows the rollers correctly. Check the bellows for obvious pinholes before relying on the camera for important photographs.

If you enjoy traditional medium format cameras, our folding cameras collection is a good place to explore classic 120 options.

Twin-lens reflex cameras

TLRs often load from the bottom to the top, with the film travelling vertically through the camera. Many have automatic counters, though some simpler models use a red window. Make sure the paper passes over and under the rollers exactly as indicated inside the camera.

Some TLRs, including many Rollei models, have a very precise loading path. If the film is not fed correctly, the automatic counter may not detect the start of the roll.

Medium format SLRs

SLR systems such as Mamiya cameras may use removable inserts or backs. Load the insert carefully, align the start arrows, then close the insert before winding to frame 1. Check that the dark slide, back latch and counter are all working as expected before shooting.

You can view our current Mamiya cameras if you are interested in modular medium format systems.

Rollei cameras

Rollei cameras are beautifully made, but some models have specific loading steps. Certain Rolleiflex cameras use feeler rollers to detect the beginning of the film. The film must pass between the correct rollers for the counter to work properly.

If you are looking for a classic square-format camera, browse our Rollei cameras.

A Simple Pre-Loading Checklist

Before loading your next roll, run through this quick checklist:

Is there an empty take-up spool in the camera?
Is the pressure plate set to 120?
Are the spool chambers clean?
Is the fresh roll still tightly wrapped?
Are you loading in subdued light?
Do you know whether your camera uses a red window or automatic counter?
Do you know where the start mark is?
Is the correct red window or frame counter selected for your format?

A Simple Shooting Checklist

Once the film is loaded, these habits help prevent lost frames during the roll:

Advance to frame 1 before taking the first photograph.
After each exposure, wind to the next frame carefully.
Do not open the camera back mid-roll.
Close the red window cover when not advancing, if your camera has one.
Keep track of your frame count, especially on cameras without automatic double-exposure prevention.
After the final frame, keep winding until the roll is fully finished.

Frequently Asked Questions

Can I load 120 film in daylight?

Yes, 120 film is designed to be loaded in daylight because the film is protected by backing paper. However, it is best to load in subdued light rather than direct sun, especially with older cameras or if the roll feels loose.

Why does 120 film have paper backing?

The backing paper protects the film from light, provides a leader for loading, carries start arrows and displays frame numbers for cameras with red windows.

Do I stop at the start arrows?

Only if your camera uses an automatic counter and has an internal start mark. In that case, align the start arrows with the camera’s start mark, close the back, then wind to frame 1. If your camera uses a red window, you usually close the back after securing the leader and wind until number 1 appears.

What happens if I wind past frame 1?

If you wind beyond frame 1 on a red window camera, you may lose that exposure or create a larger gap before the next frame. Do not wind backwards unless the camera manual specifically says it is safe. It is usually better to accept the lost frame than risk damaging the film or mechanism.

Why did I only get 11 frames on a 6x6 camera?

You may have wound too far at the start, overshot one of the frame numbers or used the wrong window or counter setting. Some old cameras also have spacing issues if the winding mechanism needs attention.

Can I reuse a 120 spool?

Yes. In fact, you must reuse the empty spool from the previous roll as the take-up spool for the next roll. Keep at least one spare spool with your camera kit.

Is 120 film the same as 220 film?

No. 220 film is longer and does not have backing paper along the full length of the film. Most current film photographers use 120. If your camera has a 120/220 pressure plate, make sure it is set correctly for the film you are using.

Final Thoughts

Learning how to load 120 film is an essential part of learning how to use a film camera in medium format. It may seem slow at first, but the process soon becomes second nature: empty spool in place, fresh roll seated correctly, backing paper pulled straight, start arrows aligned or red window watched carefully, then wind to frame 1.

The key is not to rush. Most lost frames come from simple mistakes made in the first minute of loading: a loose roll, a slipped leader, the wrong start mark or winding too far before closing the back. Take your time, load in gentle light and check the film path before you close the camera.

Once you are comfortable with the process, 120 film rewards you with large negatives, beautiful detail and a slower, more deliberate way of photographing. If you are ready to explore the format further, view our collection of 120 film and medium format film cameras.