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[yair4 0]

I have 540 TVL Camera connected to Geovision DVR Card, is it possible to buy auto iris to the camera so it can zoom ?

also, how will i be able to control the zoom ?

[Soundy 1]

First, auto-iris has nothing to do with remote zoom. A lens's iris controls the amount of light passing through the lens; auto-iris allows the camera to control that itself to adjust for changing lighting conditions.

 

Without knowing make and model (or at the very least, form factor - dome, bullet, box, etc.) of your cameras, it's impossible to say if the lens can be upgraded to even allow manual zoom and/or auto-iris.

 

Chances are though, it won't be possible, as the lens typically needs to be integrated into the camera to allow the camera to drive the zoom motor(s).