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StereoCalibration RMS Problem

Hi guys,

I have a strange Problem. I want to calibrate a vertical stereo camera system.

First I calibrate each camera individually

double rms = calibrateCamera(xObjektPoints, xImageCam1, Size(3000,4000), intrinsic, distCoeffs[0], rvecs1, tvecs1, CV_CALIB_USE_INTRINSIC_GUESS +   CV_CALIB_ZERO_TANGENT_DIST);

double rms2 = calibrateCamera(xObjektPoints, xImageCam2, Size(3000, 4000), intrinsic2, distCoeffs[1], rvecs2, tvecs2, CV_CALIB_USE_INTRINSIC_GUESS +   CV_CALIB_ZERO_TANGENT_DIST);

The RMS are 0,21 and 0,23...thats okay...but now I use stereoCalibrate and the RMS is 24

double rms3 = stereoCalibrate(xObjektPoints, xImageCam1, xImageCam2,
    intrinsic, distCoeffs[0],
    intrinsic2, distCoeffs[1],
    Size(3000, 4000), R, T, E, F,
    TermCriteria(CV_TERMCRIT_ITER + CV_TERMCRIT_EPS, 100, 1e-5)
    );

Can someone help me?

Thanks