Stereo right side out of focus

[張為超]

Hi, I just find out my right side stereo cameras is out of focus.

This situation is make me hard to do the camera calibration since the right side image is blurry and hard to detect chess board tag. In fact I tried to perform camera calibration twice and it took me very long time and unfortunately failed in the end.

Is there anyway to fix this problem besides camera calibration? Or a camera calibration with bigger tag would solve my problem (mine is A4 size)? Any suggestion is welcome, Thanks!

[A Former User]

The cameras are focused in our lab but can sometimes shift a little during shipping, you can gently twist the camera frontend to change the focus.

[Dobry Kolacz]

Stereo sensors have adjustable lenses. Indicated in the photo is the part that can be screwed in or out to change the focus.

There are four flat edges around the lens, a 6mm wrench fits perfectly on the flat edges and is the best way to adjust the focus. You can also use tweezers or pliers to adjust the lens, just be careful because you don't want to have the tool slip off and scratch the stereo lens.

When focusing, pay attention to the center of the image, sometimes there can be some blurriness around the edges of the image even when the center of the image is in good focus. As long as the center of the image is in focus, you should be able to get a good calibration.
Try to have both cameras focused to the same point for best results.

[張為超]

Thanks for answering me , I will give it a try! If i get any problem I will keep update. Thanks!