On Sun, 25 Mar 2018 18:40:47 -0600, Grant Taylor wrote:

> I'm wanting night vision and would like decent focus across a range of 5
> ~ 25 feet if possible.

Night vision. Availible light or extra Infra Red illumination? The
ordinary Pi camera is not very sensitive and doesn't see as well as
the huamn eye does in the dark. The NOIR (No Infra Red filter)
version doesn' have the IR filter that the normal camera does, this
does mean that you can use IR illumination(*) but daylight colours
are messed up due to the IR.

You can get solenoid operated IR filters that you can place in front
of the of a NOIR camera and switch the filter in/out IR ilumination
on off, depending on the image from the camera. I don't think there
is such a filter specifically for the Pi NOIR camera so it would need
some jury rigging to fix in place.

The Pi cameras are "pin hole" so focus from about 6" to infinity.

(*) 850 nm, there will be a dulll red glow from the illuminator, you
need to go to 960 nm for fully covert ilumination but the sensitivity
of most camears at 960 nm is significantly less than that at 850 nm.

--
Cheers
Dave.

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