Questions · Cameras
Is a varifocal lens better than a fixed one?
You pay for the varifocal to get the field of view right on site and to be able to correct it later; you choose the fixed one when the point is so clear that there is nothing to adjust. On a real installation you hardly ever know the exact field of view until you are up there with the image in front of you, and that is why outdoors the varifocal usually pays for itself even if it costs a bit more.
The other difference is what happens two years from now. A hedge that grows, a new skip or a reorganisation of the industrial unit are sorted by nudging the zoom from the browser if the lens is motorised, and are sorted by going up a ladder and changing the camera if it is fixed.
Where the fixed one wins is at repeated, controlled points: identical corridors, cash machines, internal doors. Buying twenty identical cameras with the same lens simplifies the spares and makes the twenty images look alike, which is more useful than it sounds when you have to review twenty recordings one after another.
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A written answer is enough to decide whether it interests you. To know whether it works at your site you have to see it on a real scene, with the image as it is and, on top of it, what the system understands from it. That is on the IRIS Neural website, which is the group's product.