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Makernotes usually store the lens type in some way. Sometime as a string, sometime as an numerical ID, or something else. There is not standard and it is mostly per vendor.
# References
## Nikon
* [[Nikkor Lens ID|http://www.rottmerhusen.com/objektives/lensid/nikkor.html]]
* [[Nikkor Extended Lens ID|http://www.rottmerhusen.com/objektives/lensid/thirdparty.html]]
## Pentax
* [[Pentax Lens ID|http://homepage2.nifty.com/mak_kawa/digicam/lens/lensid/lens_id.htm]]
## Canon
* [[Canon LensType from ExifTool|http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Canon.html#LensType]]
Canon cameras do not have a reliable "[[LensType|LensType]]" field. For example my 20D does not and put 0xffff, while some later Rebel model does.
So there are two ways: if you have a consistent [[CameraSettings|CameraSettings]].[[LensType|LensType]], use it.
If you don't (0xffff for example) you have other lens info that should allow to reduce the list to a bunch and require some user selection for the few last cases. For that there are a few fields in the makernotes:
First the [[FocalLength|FocalLength]].[[FocalType|FocalType]] to see if it is a zoom or a prime.
Second [[CameraSettings|CameraSettings]].[[LongFocal|LongFocal]] and [[ShortFocal|ShortFocal]], and [[MaxAperture|MaxAperture]] + [[MinAperture|MinAperture]].
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