Determining Focal Length Approximation

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Sep 18, 2017
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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 amazing in comparison.

I'd like to be able to know approximately what focal length level or FOV I am looking at as I play with various zoom levels. I'm a total newb here. Please enlighten me.
 
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