>> 8. If you're using a 2D *camera* instead of a real laser barcode 
>> scanner, multiply all of the above issues by 7.
> 
> Not really. Just pick a random straight line through the picture, and 
> pretend that's your laser beam.

Except that a human wouldn't aim the laser beam at random, see? Also, as 
I understand it, lasers don't go out of focus...

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