When creating the lens file using Aximmetry Basic Calibrator, I encountered a situation: when both zoom and focus are set to 0, the calculated FOV angle does not match the virtual FOV angle shown in Aximmetry.
Here's the detailed issue: I can calculate the FOV angle using my own hardware, and for 9 out of the 10 calibration points I created, the FOV values are accurate and consistent. However, for the point where both zoom and focus are 0, there's a discrepancy.
According to my calculation, the real FOV angle at this point should be 65.8°, but when I input this value into Aximmetry, the virtual scene becomes noticeably narrower—specifically, two virtual columns appear significantly smaller than the actual columns in the real scene. After some testing, I found that setting the FOV to 62° in Aximmetry allows the virtual and real scenes to align properly.
My question is:
Does Aximmetry impose an upper limit on the FOV angle?
In other words, is it possible that while the real camera uses a FOV of 65.8°, Aximmetry internally restricts it to 62°?
No, there is no upper FOV limit; you can set it as high as 180 degrees. This might be an interpolation issue you are experiencing due to other calibration points being very close to this FOV or potentially higher. Additionally, having the zoom and focus set exactly to 0 could be causing problems. Try setting them to very small values, such as 0.001, instead of 0.
Sharing the calibration file would greatly assist in debugging this issue. If you can, please send the calibration file as an attachment in an email to sales@aximmetry.com and reference this forum post in your message.
Warmest regards,