I have been using a Canon T4i for a few months now to take panoramic shots of apartments. I use a Sigma 8mm fisheye lens on a Nodal Ninja Ultimate R10 head.
I have the camera set to 16:9 aspect ration with 3456x5184 resolution (Not the highest "L" setting but the next highest "L" setting).
I've noticed that when I look at the dimensions on the images, sometimes they are at 2912x5184 and other times it is 3456x5184.
During a shoot I do not change any settings on the camera other than white balance. I do shut off the camera and have to re-enable "Exposure Comp / AEB Setting" but that is all I am changing.
Can anyone tell me why I am seeing images with different widths?