What are the minimum focus distances of the FLIR A35 and A65 cameras?

It is possible to back the lens out of the lens flange a significant amount before it literally falls off the hinges. This would result in pretty good focus at distances that are smaller than our published minimum focus distances.
However, there are a few considerations:
 - Lens designs are most ideal when focus is set to infinity or hyperfocal. Things like relative illumination, MTF over field, and stray light may start to take on different effects when a lens is defocused. These effects could result in image artifacts that may be intolerable for some applications. FLIR does not validate how the A35/A65 lenses perform when focused on objects that are not at infinity or hyperfocal, so defocusing the lens could affect performance.
 - The mechanical stability of the lens may become compromised if it is defocused too much. This would result in the lens hanging on by a few threads on the end of the lens flange.

All in all, the lenses can be defocused, but a customer should be aware that some unintended effects (like the ones metioned above) may come into play.

Some validation should be done on the integrator/engineer's end to ensure that the system performs the way it is intended to.