Polaroid Pack Film Camera Conversions

Using alternate film in a Polaroid cameras

Polaroid Negatives •  4x5 •  Instant Film •  Roll Film



Since that fateful winter of 2016, when Fuji announced it was discontinuing production of all pack film, it became clear that these cameras would fall into disuse over time. Though expired pack film is still available, it's only a matter of time before all stocks will be dried up and gone. One Instant's efforts to revive the film is limited and expensive. Although pack film will be lost, all is not lost. By using alternate film, these Polaroid cameras can still produce photos, and though they will not share the same characteristics as pack film, they have their own unique charactaristics.

Using alternate film can be as easy as loading a negative into an empty film pack then processing it in a darkroom, or as involved as removing the back and cutting the camera to fit an alternate back. Film types can be divided roughly into 3 types: negatives, instant, and roll film. Within each category are different options. If you have any questions, don't hesitate to contact me.

Negatives

Using an empty film pack

A Polaroid pack film camera can use paper or film negatives without modification just by loading the negative into an empty film cartridge, then loading it into the camera. However, if using paper negatives it is best to consider the following factors:

  1. The camera should be equiped with a tripod socket. This would necessitate using a camera with a metal body.
  2. Either the electric eye should use a compensating neutral density filter (depending on the speed setting/aperture used), or the electric eye should be taped with black tape and the exposure done manually with a cable release. For example, a 4 stop ND filter would be needed over the electric eye when using the 75ASA setting with a multigrade filter.
  3. Using photographic paper as negatives results in negatives with higher contrast. Contrast can be lowered by using multigrade paper with a 1/2 filter in front of the lens. This will lower the ISO to 3, and result in a more usable negative.
  4. Using paper negatives without modifying the camera will require the negative to be loaded in a dark bag or darkroom. If more than one picture per camera is needed, a dark bag will be needed on the field.
The process for paper negatives is explained in this video, and an example of the full process in demonstrated in this video

A field developing kit which fits into a backpack can be put together to develop these negatives on the field. This will require the following:

  1. A darkbag
  2. A developing drum for the negative.
  3. Chemicals: at least developer and fixer. Stop bath will help preserve the fixer.
  4. Rinsing trays: I use 3 rinses in minimal water, tossing the 1st rinse and refreshing the last rinse with new water.
  5. Water: 1 litre can last for 6 or 7 negatives with the 3 rinse method. A waste water bottle is nice to keep from polluting.
  6. Squeegie to remove water from negative.
  7. A drying box to keep negatives separate while drying.

Making photos out of negatives is possible, though a method to contact print and control the exposure with ambient light would be needed, or a self contained battery powered contact printer.


Using negative film holders

A pack film camera can be converted to use a Polaroid sized film holder, which can hold either a paper or film negative. This will require the camera back to be modified permanently, or the use of a 3D printed back, which can be downloaded here. Film holders will also need to be built. The advantage of this procedure is that you can take as many photos as you have film holders, without having to load the paper negatives on the field with a dark bag. This is more suitable for field work, though you won't see the photos until you process them. Click here for more info.

4x5 film in a pack camera

Although shooting 4x5 in a pack camera is possible, the 114mm lens does not cover the film area completely, with some vignetting on the corners. This conversion involves replacing the whole back and hinge assembly with a custom 4x5 back which uses smaller film holders which allow the back to be designed within the dimensions of the pack film body, and make it possible to shoot 4x5 without moving the rangefinder and losing the tripod socket. The film plane is moved back 18mm to allow an expanded image area beyond the polaroid sized image, so the lens body has to be moved back the same amount. Custom film holders need to be made in order to use with this conversion.

4x5 film in a roll film camera

Roll film cameras, especially models 110, 110A, and 110B, are good candidates for 4x5 film because they have 127mm lenses which adequately cover a 4x5 film plane. This conversion uses the same custom film holders as the 4x5 back for pack film cameras, as they will fit within the size limits of the camera body. It is not graflox compatible but the design fits into the size and shape of a roll film camera. The conversion involves removing the 2 backs, the positive spool, and installing the 3d printed one.

Instant film

Fuji Instax Wide Film

Instax wide film is the closest format to pack film available. The image area is smaller and the film is integral so it has the look and feel of a typical Polaroid picture. The advantage of using Instax wide is the image orientation is correct since the film is exposed from the rear, reversing the reversed image from the lens without the use of a mirror. This permanent modification requires a lot of careful cutting and filing and modifying the lens standard to move it back to match the film plane. It is not for the faint of heart. Click here for more details.

Polaroid film

Since it's revival, Polaroid film in its SX-70, 600, and i-type formats has improved steadily. Development times are still around 15 minutes to see a good image and around an hour for it to be fully developed, but the colours are much better and consistent. The downsides to modifying a pack film camera to use Polaroid film are image orientation, and the film format.

The biggest issue I see is that photos produced from this modifcation are horizontally flipped or reversed. Writing is backwards, and things are the reverse of what you actually see. The only solution for this is to put a mirror in the light path of the subject. The next issue, the format, is characteristic of the film itself. Polaroid discontinued spectra film abruptly, which would have been the best candidate for this camera. The square format is different from the original format and photo, being a plastic envelope with transparent window makes it look and feel like a newer instant photo.

This conversion also requires a donor camera for the back. The best camera to use is a foldable SX-70 camera, which can be a big sacrifice. Even unworking cameras have the promise of being revived by the developments of the OpenSX-70 project. Electrical modifications need to be made to the SX-70 back, as well as integrating these modifications to the pack camera. This the most difficult conversion to do. Click here for more details.

Roll Film

Polaroid pack film cameras can be modified to use both 120 and 35mm roll film. The modification to the body is limited to a small groove filed into the back of the camera to make room for the film advance knob. The back however, will need to be permanently modified to make room for the film spools. Alternatively, a 3D printed back can be made to replace the standard back. Access to a 3D printer is necessary to print the parts needed for these conversions. The following formats are provided here:

120 film 6X6 format

This is a failsafe conversion which takes 12 square formatted photos per roll. The film path is fairly straight which makes it easy to implement. Information on this conversion can be found here.

120 film 6X9 format

This conversion is more difficult to get working smoothly because of the longer film path that must be taken. The biggest challenge is overcoming friction wherever it occurs and providing the correct clearances for the film and backing to move through the system. This will yield 8 photos per roll. Find out how to do this conversion here

35mm film 3.5x10 panorama format

This format which includes the sprocket holes covers over 50% of the image area but is confined to the middle horizontal plane. This conversion is a variation of the 6x9 format, though is not as difficult to get working. It requires an additional 35mm cartridge for a take-up spool and though it will work with a commercial roll of film, you will have the best flexibility using a bulk film holder. The instructions for this conversion can be seen here


Single Negatives •  Instant Film •  Roll Film