[skamp]

Originally Posted by LisaNewton

Thank you for your thoughts, Travis. Your assessment of the first two shots may be correct. However, after reviewing my data, in the case of the second two shots, the focal length was the same, 55mm, with each lens. Plus, using the Nikon ViewNX, I was able to see where the shot was focused, and yes, I was using Aperture Priority. I'm not sure how I would copy this data here, but the focus area in both photos is directly in the center.

So, could it still be the hood in the case of the same focal length and same focus even with two different lenses?

You may have been focusing on the same point but, seeing as your angle of view is different between the two shots your metering system is probably registering off different light ranges resulting in the exposures you have posted. In order to perform this test properly, you need to mount your camera on a steady tripod and change nothing but the lens hood to see the effects the hood induces.