Question: How to get camera serial number from EXIF ?

---

Edit: some folk think that not all (or even many) cameras store serial number, but I tried four from different manufacturers and they do. So, let's just rephrase it as "How to get camera serial number from EXIF if there is any?"

Answer: 
First the camera would have to write its serial number to the EXIF data. I don't know of any that do.

But in any event, you'll have to check with the documentation of the specific camera in question to see if it writes this value and where it writes it. There's no standard place for it, since it's not a standard thing to write (such as `Manufacturer` or `Model`).

You can see a lot about the EXIF specifications [here](http://www.exif.org/).
Almost all DSLR cameras code the serial number into the EXIF info in the maker notes section. The reason most people don't see it in the EXIF info is that Adobe products all but ignore the maker notes section of the EXIF info. So if you are viewing the EXIF info using an Adobe product you won't see the serial number. But that doesn't mean it isn't there, it just means Adobe isn't displaying it.