I recently compared two of my long lenses and am confused by the results. Using my D 300 body I put on my Nikon 80 to 400 lens set at 300 mm. I then attached my Nikon 18 to 300 mm also set at 300 mm (also on the D 300). It definitely appeared to me that the 80 to 400 lens had a much narrower (re longer) view than the 18 to 300 mm lens. I was under the impression that both lenses would have the field of view at the same focal length because of of the same crop factor.