How to create a single calibration for all cameras?

Hi @TKSharpless
Which parameter do you exactly mean? If the parameters should be optimized, they will be slightly different for the images (it depends on your settings).
You can choose all images in 1Ds view and set the Calibration group (under Prior calibration) and Lens group (under Registration calibration) to some number.
After the alignment all cameras from the same group should have the same registration values.