What are the lens options and the minimum focus lengths for the Photon? What is the range of focus? Is it possible to adjust the focus of Photon lenses manually?

The table below details various lens parameters. Photon camera/lens calibrations are performed with lenses focused closer to the hyperfocal distance than infinity, such that infinity is in good focus but the best near field performance is also achieved.

Although Photon lenses are capable of focusing to shorter object distances, it is important to note that they are not designed, calibrated, or specified for this purpose. Using a Photon that has been calibrated as described above (in the range of the hyperfocal distance to infinity) for very close focus applications requires changing the focus, which may result in possible image anomalies, non-uniformities, and/or degraded performance. Customers should be aware of these limitations and evaluate the images for issues. 

We describe the range of focus to mean the hyperfocal range, that is, the range between infinity and some point less than infinity through which the lens remains in focus. All Photons with lenses are factory-calibrated with the lens locked at infinity focus.

All of the Photon lenses shown in the table above use a screw-thread mount. The lens focus is locked by a small setscrew.

To adjust the lens focus to something other than infinity focus, or to achieve the shortest possible focus, requires that the setscrew be loosened. It may not be possible to lock the focus at a close focus point since in some cases the lens in almost out of its holder. FLIR does not offer spacers for macro focus.