iPhone application for focal length

snapshotgt

n3wb
Joined
Jul 30, 2020
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Location
Texas
Does anyone know of an iPhone application that would aid in selecting proper camera focal lengths? Seems like it would be a very useful tool, perhaps even input the model of camera to adjust lens particulars? I know there is the IPVM Calculator, but haven't had much luck with that -- dealing with two narrow 5'x62' side-of-house walkways on either side and trying to calculate best placement for entry gate identification within 35' of that gate.

Basically looking for a more affordable alternative to installing 2x IPC-T5442T-ZE on either side of house.. (already purchasing two IPC-T5442T-ZE for front, rather buy cheaper fixed lens cameras for side at the same time.)
 
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