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For anyone interested, I found this which is at least a close approximation to what I'm after Dahua Starlight Fixed Lens Turret (IPC-HDW4231EM-AS)

Hi all, Question: can one approximate the focal length or FOV for a given zoom level in Blue Iris? I recently acquired the famous Dahua Starlight varifocal turret (5321) and I'm loving it. My previous camera was an older 3mp Dahua 3.6mm bullet with an Aptina sensor. This Sony Exmor sensor is...