I had sort of a busy day but I went out this evening and did some testing. See if you can open this;
Picasa Web Albums - jlmerrill73
A shot aperture priority through all of the f-stops on my three main lenses. I didn't upload all of them.
The first one is my 12-24 zoom stopped way down, the second one is with it wide open.
The third is my 18-55 zoom stopped down and the forth is it wide open.
The fifth is my 28-300 stopped down and the last is it wide open. This lens showed the most difference but not a lot.
As you can see they are not real bad, but these were taken in the shade as the sun was going down. The highlights are blown out like it was mid day. It just started doing that about a month ago. It is really bad in bright sun, even with a polarizing filter.
I have a manual 50mm lens off of my 35mm camera and I will do some tests with it tomorrow. I ran out of sun today and if I did this with a flash, it would just complicate things.
Thanks for your help and suggestions.