Framing problems

Hello ,
I am having some problems with framing and mosaic. I generated a new profile for my canon 70d camera and a TAK-fs-60 scoop . I entered all the values of the camera and scope, but when i create a sequense with framing and mosaic, the field of vieuw is incorrect ( to small). When i changed the value of the pixel size , the square on the picture will change , but when i change the focal length of the scope the square does not change .
So the calculation of the FOV is wrong!!