Your camera distortion parameters are unknown
Submitting an AT will provide you these parameters
You can export them as an *.opt file by right-clicking on you aero-triangulated Photogroup
Import optical properties
You completed a camera calibration, and you know accurately your camera's distortion
parameters
You can import them as an *.opt file by right-clicking on your Photogroup, before
submitting the AT
Then in the AT settings, turn the default parameter on "Keep" in the distortion estimating policies
http://communities.bentley.com/products/3d_imaging_and_point_cloud_software/w/wiki/25554.the-block-is-affected-by-a-spherical-effect-after-aerotriangulation