lens choice for high res video camera

Currently I'm working on an job where a lightfield is projected on a
foil. On the other side of this foil a ccd video camera looks to this
projected image. From this image the dimensions will be determined
using IMAQ- Vision from National Instruments. I've not much experience
with optics and can't get clear which lens to use.

The camera used is an Adimec 4020m with a resolution of 2048*2048 pix.
The CCD sensor size is 15.15 *15.15 mm. The field of view (FOV) is 400
*400 mm (the area inside the light field is projected) The working
distance (WD) is fixed and should be approx. in the range of 500-700mm.

Some simple calculations lead me to a focal length of 22.7
[focal length = (sensor size * working distance)/FOV = (15.15 *
600)/400)]
Can I now simply choose a lens with focal length of for example 25
(leading to a WD of 660mm)? Or is this just too simple?

Also the depth of field (DOF) should be as small as possible to avoid
problems with "seeing thru" the projection foil (seen in experiments
with older test environment). I know that a small lens diameter in
combination with a large sensor size and a large aperture (diaphragm)
gives a lot of distortion. What is the impact of this for the lens
selection?

The camera is supplied with an adapter from c to f-mount. If I'm
correct informed this gives me more choice for lenses with a larger
diameter?

Thanks for any suggestion!

Regards,
Buster

.

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