Vision sensor focal length

[Zain_Lakhani]

Hey everyone, is anyone aware what the focal length of the vision sensor is?

[jpearman]

See this.

Vision sensor FOV measurements

I’ve been asked a few times about the vision sensor field of view. I wrote in this thread that is was 67 deg, that was based on quick measurements with a target pretty close to the sensor, that number is close but not correct. @Windows10010 posted earlier today here that they thought it was 30 deg, that seemed way too narrow from what I remembered. I used to do this type of measurement often as I worked in the film industry for a camera manufacturer. It’s pretty easy to do, harder with this …

[callen]

That quote is about field of view, not focal length. These are two quite distinctly different things, though there is a relation when you’re dealing with how much of an image can be projected onto the receptors. Of course, the original question is a little quirky, as usually cameras have ranges of focal lengths, rather than a single focal length. As the question is in a VRC channel, I’m not so sure focal length really matters. You’ll have no problem getting objects from the maximum 17 feet on a field down to pretty close to the camera in focus to identify them. Since the VRC objects aren’t tiny, once an object is too close to the camera, it will take up so much of the field of view that identifying anything other than the color starts becoming pretty meaningless, so losing focus won’t really be an issue. So, while I cannot tell you the range of focal lengths, I doubt it really matters in VRC beyond knowing the range is more than sufficient.