|Surveyor Robotics Journal|
Sun, 24 Dec 2006
We recently received some samples of alternative lenses for the SRV-1 camera module, and took some comparison snapshots today in relatively low light. The new lenses are designed primarily for monochrome cameras, as they have no IR coating, and the ambient IR tends to wash out the color sensitivity of the camera imaging element. However, these lenses have significantly better light sensitivity, so there is always a tradeoff.
Here is a group shot of the 3 news lenses below the camera module with the standard lens. The standard lens is F2.8 with a 57-deg field of view (FOV). The lens on the lower left is F2.0 with a 66-deg FOV, the middle one is F.20 with 86-deg FOV, and the bottom is F2.5 with 118-deg FOV
Here are snapshots from the robot in approx the same position with no lighting change. First is the standard lens (57-deg) -
Next is the F2.0 66-deg lens -
Next is the F2.0 86-deg lens -
Finally, the wide angle F2.5 118-deg lens -
You can see how the colors wash out with the uncoated lenses, though it is easy to see the difference in light sensitivity. It would be interesting to find versions of these new lenses that have IR coating, since that might provide an ideal combination, though there might be application for the uncoated lenses.