Your right, and that's why I clarified they talked about sitka gear. But, it lines up regardless and I'm not trying to sell nor do I own sitka gear but I agree with their view on what a deer sees. It has been proven that deer have receptors for blue and yellow. When you have receptors for a certain color that means you can see that color, doesn't mean you see IN that color like you photo example. Whatever colors you don't have receptors for you will see in gray. My wife agrees with me on this issue of colorblindness and she is a doctor herself.