Hacking Single Lens Reflex Cameras with Barcodes

Posted March 24th, 2010 by ch3ka

Cool Stuff :D

The Elan/100, like its predecessor the 10/10s, works with an optional Barcode Reader E accessory. This was an experiment in simplifying the camera’s user interface for novices. Or, to be less charitable, an expensive gadget-driven idiot mode.

Basically it works like this. You get a booklet of barcode settings, each illustrated by a photo. (the scanner shipped with a small booklet of barcodes, EOS Photo Files, but Canon also sold a companion volume - EOS Barcodes 101 - stuffed with even more useful and exciting barcode settings!) The photo will be of a typical setting - a backlit item or a flower or a landscape or whatever. You look at the item you want to photograph, flip through the book until you find a similar photo, scan the barcode from the book and then input the barcode into the camera. The barcode is then used to program the camera.

Hacking the barcodes.

The barcode reader wasn’t a very popular feature. In fact, it really was a fundamentally flawed concept from a marketing standpoint - the only people who’d really want such a feature would be rank beginners. However, because of the cost of building the system, only fairly costly midrange cameras supported it. So Canon quickly dropped the barcodes - the 10/10s and the Elan/100 were the only ones bearing this dubious capability. However, there is one handy thing about it. And that is tied to the key word “programmable,” the hacker’s favourite word.

Basically, inquisitive people have figured out how the barcode system works and have written small programs so that you can write your own custom barcode programs. These programs let you design your own custom PIC modes - sometimes even accessing camera functions not available through the camera’s external buttons and dials. You then print out your custom barcodes on your PC or Mac (the camera uses Interleaved 2 of 5 formatting). This can be lots of fun to play with if you happen to be a geek.

See http://photonotes.org/manuals/eos-elan/#barcode for more - fantastic website and yeah I'm ignoring his copyright notice here, but hey I do not care for US or whatever law and I think it is fair use ;)

If you liked this, buy me a beer and / or comment below

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