How do you enter a specific focal length in MMP.  
I've tried everthing I can think of but every time I solve the camera the focal length is reset to a value MMP thinks it should be (which is definately wrong since real world 90 degree angles are way off corresponding with a 3D cube or grid)
Perhaps the focal length can't be set b4 solving:
So
After solving can one change the focal length for all frames? When I try it only changes it for the frame I am current on and the rest of the frames remain as what the solver set them to. (I could go through every frame manually but there must be a proper way to do this!!)
 
Thanks for your time
regards
Graham

Hi,
 
You should set your initial focal length in the camera parameters window
and set your focal to be "constant fixed" instead of "constant initialized" (the button between computed focal length and initial one)
 
hope it helps,
 
Niko