Quote:
Originally Posted by Daniel_LaFleur
Being perfectly 'in focus' is not important, you are correct. But being out of focus will lessen the energy recieved by the sensor, and as such will make it less sensitive (requireing more light to trigger).
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You're still talking about this as an imaging application, but that's not the case. The sensor is essentially unfocused to begin with. A suitably sized lens can only
increase the energy it receives, and will thus make it
more sensitive.
You're correct to a point, in that being "out of focus" will result in less light on the sensor than if it were "in focus". But if a converging lens is positioned so that the optically receptive part of the sensor casing is at its focal point, it will still put more light on the sensor than if there were no lens at all.