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I assumed that is what you wanted which is why my first reply mentioned hyperfocal distance. To explain further, camera lenses have a characteristic that means that not all distances can be in focus at the same time. If you want a distance range to be acceptably in focus then it is better...

You are using the term "focal plane". This is the point on an optical system where the image height and width is formed and nothing to do with any point distant. I'm curious as to why you would need to know this distance which is from the nodal point of the lens to the sensor?

Hyperfocal distance is dependant on the aperture. Generally it results in a point 1/3 distant from the camera lens to the farthest required point of focus.

Update: I opened up the camera that had been used when I altered the password and pressed the reset button for 30 seconds. I was surprised when the focus ran to the end and it took four attempts getting the software to refocus it. Anyhow all is now back to default and I now must retry to...

I managed to enter my IP address range and only then did I see my camera. I'm trying to change the IP address from the default and somewhere along the line I had to select a new password. I then tried to change the Ip address, entered the correct subnet mask and gateway but got a "failed to...