License Plate Recognition @ 75 Meters (246 Feet)

Apparently I have a client who wants to be able to read license plates AND see peoples faces at a gas pump or something along those lines 75 meters away. I did some quick field of view calculations and with analog I get a requirement of 193mm lens, and for an Axis 720p, their calculator is telling me I need 94mm. Both to maintain 100 pixels per foot.

Anyone have any experience with doing license plate recognition at this distance? Right now I'm looking at the Axis P1604-E with a tamron 20-100mm lens, how ever it's not a lens listed on Axis' website, though it is CS mount.

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