Lyla Lindsey
DX numbers are unique identifiers with a variety of applications. In Australia, a DX number is a reference to the document exchange, which is a subscription service that allows members to send unlimited mail to other members for an annual fee. DX numbers are also used to identify film emulsions, with a specific numbering system that indicates the manufacturer and type of film. This film canister barcode is typically a six-digit number, with the first digit being a proprietary prefix assigned by the manufacturer.
| Characteristics | Values |
|---|---|
| What is a DX number? | A number that uniquely identifies the type and manufacturer (sensitizer) of a film emulsion |
| Who assigns DX numbers? | The International Imaging Industry Association (I3A) |
| What is the format of a DX number? | CCC-SS |
| What is CCC? | "Combination code", also known as "DX Number Part 1", which identifies the manufacturer and emulsion type |
| What is SS? | "Specifier number", or "DX Number Part 2", which distinguishes between different varieties within the same family of emulsions |
| What is the format of a film canister barcode? | A six-digit number in the format PHHHHE |
| What is P? | A proprietary prefix ranging from 0 to 9, assigned by the manufacturer |
| What is H? | A four-digit code generated by multiplying the combination code by 16 and adding it to the specifier number. The result is prefixed with zeroes, if necessary, to make four digits |
| How to recover the DX number from the hashed code? | Divide by 16, which gives the Part 1 number as the largest whole integer and the Part 2 number as the remainder |
| What is E? | A code digit for the number of full-frame exposures: 1 is for 12 exposures, 2 for 20 exposures, 3 for 24, 4 for 36, 5 for 48, 6 for 60, 0 for 72 and 7 for non-standard lengths such as 24 + 3 |
| Where is the DX number located? | Along the bottom edge of the film in the "data track", which is one of two parallel tracks of barcodes (the other being the "clock track") |
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What You'll Learn
- DX Mail in Australia is a reference to the document exchange
- DX Mail is a subscription service used by law firms and large businesses
- DX addresses have a unique 3-line format: Organisation name, DX number, Exchange name
- DX numbers are also used for film emulsions to identify type and manufacturer
- DX numbers for film emulsions are separated into two parts: CCC-SS
DX Mail in Australia is a reference to the document exchange
Today, DX Mail is a subscription service that allows members to send unlimited amounts of mail to other DX members for an annual fee. The company has established DX hubs in numerous locations across Australia, functioning as DX "Post Offices". These hubs facilitate the exchange of mail between members.
The service is commonly used by law firms and has also been adopted by larger businesses for inter-office correspondence. These businesses have set up DX boxes at their offices for this purpose. To send mail via DX, one must locate the recipient's DX address, which consists of the organisation name, DX number, and exchange name. This information can be found through the DX Online Directory or other directory services.
While DX Mail offers convenience, it does require someone to physically go to the DX hub twice a day to collect and send mail. This can result in unproductive time wastage for businesses. To address this, specialised mail courier services, such as Everyday Mail, have emerged to collect and deliver DX Mail directly to and from offices, freeing up staff time and offering additional services like bulk mail preparation and lodgement.
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DX Mail is a subscription service used by law firms and large businesses
DX Mail is a subscription service that allows members to send unlimited mail to other members in return for an annual fee. The service is primarily used by law firms, rooted in the legal profession where clerks from different firms would meet to exchange relevant documents. Today, DX Mail has expanded to large businesses, which use the service to send correspondence and documents from office to office.
The organisation responsible for DX Mail has set up DX hubs in many areas, which act as DX "Post Offices". Members can send mail to other DX members by looking up their DX address using the DX Online Directory or other directory services. The DX address format consists of three lines: the organisation name, DX number, and exchange name. Members can then take their mail to their local exchange and post it into the Outgoing Mail Box before 5 pm.
For businesses, this process can be time-consuming, as a staff member must visit the DX hub twice a day to collect and lodge mail. This, coupled with similar trips to the Post Office, can result in a significant amount of unproductive time. To address this issue, specialised mail courier services, such as Everyday Mail, have emerged to collect and deliver DX Mail and regular mail directly to and from offices, freeing up staff time and saving money.
In addition to convenience, DX Mail offers a unique addressing system that does not rely on traditional postal codes. This allows for the direct delivery of mail to specific companies or departments within an exchange, enhancing the efficiency of mail delivery and ensuring that sensitive legal documents reach the intended recipient securely and promptly.
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DX addresses have a unique 3-line format: Organisation name, DX number, Exchange name
DX, or Document Exchange, is a subscription service that allows members to send unlimited mail to other members for an annual fee. The service originated in the legal profession, where clerks from different law firms would meet at a designated spot each afternoon to exchange documents. Today, DX is used by law firms and other large businesses to send correspondence and documents between offices.
When sending mail through DX, users are required to follow a unique 3-line address format: Organisation name, DX number, and Exchange name. This format differs from a typical postcode address. The DX number is a unique identifier assigned to each customer who is a member of the DX Document Exchange. This number can be found printed on the door label of the customer's DX Exchange box.
To send mail through DX, users must first find the DX address of the recipient company, which can be done through the DX Online Directory or other DX Directory services. The mail should include the recipient's name and 3-line DX address, with the sender's own DX address details in the top left corner. Outgoing mail can be dropped off at the local Exchange's Outgoing Mail Box before 5 pm.
DX provides a convenient way for businesses to send mail, particularly when sending documents to other members within the same Exchange. However, it does require sending a staff member to the DX hub twice a day to collect incoming mail and lodge outgoing mail.
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DX numbers are also used for film emulsions to identify type and manufacturer
DX numbers are used in the context of film photography to identify the type and manufacturer of a film emulsion. The DX encoding method was introduced by Kodak in 1983 to simplify the handling of 35mm film in 135 format cartridges. The DX number is divided into two parts: the combination code (CCC) and the specifier number (SS). The combination code identifies the manufacturer and emulsion type, while the specifier number distinguishes between different varieties within the same family of emulsions. For example, Agfa Perutz 3-color ISO 200/24° film is assigned the DX number 115-4, while the equivalent Perutz 3-color ISO 100/21° film is assigned 115-3.
The DX number is printed as a barcode on the bottom edge of the film, below the sprocket holes. This barcode is known as the DX film edge barcode and consists of two parallel linear barcodes: the clock track and the data track. The data track contains information such as film type, manufacturer, and frame number. The DX number can also be found on the outside of film cartridges as a DX Camera Auto Sensing (CAS) code, which is readable by many cameras. This code allows cameras to automatically determine the film speed, number of exposures, and exposure tolerance.
The DX encoding system was quickly adopted by the photography industry, with the first DX-encoded film released in March 1983 and the first point-and-shoot cameras using DX encoding launched in 1984. The success of the DX encoding system led to its incorporation into industry standards, and it is now part of the ISO standard 1007.
In addition to Kodak, other companies such as Fujifilm have also developed film identification systems that utilise DX numbers. Fujifilm's Barcode System, introduced in 1998, uses a 13-bit barcode that includes the I3A-assigned DX number, the number of exposures, and a proprietary manufacturer's code. This system is compatible with a range of medium format cameras that can optically scan the barcode to access this information.
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DX numbers for film emulsions are separated into two parts: CCC-SS
DX numbers are used to identify the type and manufacturer (or sensitizer) of a film emulsion. These numbers are assigned by the International Imaging Industry Association (I3A), which publishes and sells a proprietary list of DX numbers for APS and 135 film formats. The last edition of this list was published in January 2009 and was entitled "DX Codes for 135-Size Film".
A DX number is typically comprised of two parts separated by a dash: CCC-SS. The first part, CCC, is known as the "combination code" or "DX Number Part 1", and it serves to identify the manufacturer and emulsion type. The second part, SS, is called the "specifier number" or "DX Number Part 2", and it distinguishes between different varieties within the same family of emulsions. For example, Agfa Perutz 3-color ISO 200/24° film is assigned the DX number 115-4, while the equivalent Perutz 3-color ISO 100/21° film is assigned 115-3.
The DX encoding system was first introduced by Kodak in 1983 to simplify the handling of 35mm film in 135 format cartridges. It quickly gained success in the marketplace, and the first DX-encoded film, Kodacolor VR 1000, was released in March 1983. By 1984, the first point-and-shoot cameras that used DX encoding to automatically set film speed were introduced, including models from Pentax and Minolta.
The DX encoding system was later incorporated into ANSI PH1.14, which provided standards for 135 film magazines for still picture cameras. It has since been superseded by NAPM IT1.14 in 1994 and is now part of the ISO standard 1007, last revised in 2000.
In 1996, an expanded DX encoding system called DX-iX (data exchange - information exchange) was introduced as part of the Advanced Photo System (APS). This system used a different cartridge and film size, known as IX240 film. APS film and cameras were marketed under various brand names, often including an "ix" to emphasize the information exchange capability, such as Advantix by Kodak and Nexia by Fujifilm.
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Frequently asked questions
DX stands for Document Exchange.
DX Australia is a subscription service where members can send unlimited mail to other DX members for an annual fee. There are DX hubs in many areas across the country where members can send and collect mail.
A DX number is a unique identifier for a company that uses the DX service. It is part of the 3-line address format used by DX, which includes the organisation name, DX number, and exchange name.
You can find a company's DX number using the DX Online Directory or other DX Directory services.
