Canon 20Da field of view

Today I measured the field of view of the Canon EOS 20Da Red/almost-near-IR sensitive camera.  The field of view in the view finder was 4.035° ± 0.01° by 6.095° ± 0.01°.  The view finder field of view is smaller than the actual image size.  For example, my measurements showed that there is another 0.16° above and 0.06° below the view finder field making the total image height 4.246°.