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Ray, yes, I am talking about dries. Like the ones I photographed.

Thanks Bruce
I think he covers it in sections 3-6 on that link.

I believe that the founder of this site has a short explanation of how the trout "sees". Can't locate it now, but perhaps someone has a link to his summary? Caswell?

Marine biologists and other scientists have studied the trout's optics and know how their vision works.

Very interesting AlanB. I think we are not far apart in our thinking.

What I say about the way we see our flies applies when they are in the vise and while fishing. We see them from above or...

My original post used the specific example of the X-Caddis fly pattern. Hans mentioned his success with the CDC&Elk in mayfly situations.
I would argue that the CDC&Elk is substantively different...

This has been my experience, and those of many authors on the subject: When trout are keying on a specific hatch of mayflies, they often become "sippers". They lie in the feeding lanes, and, as...

Steven, That is sort of my argument. All studies (that I am aware of) of what a trout sees in the water agree that they first sight wing tips of an insect or a fly coming into their "window" of...

A fishing friend (and many others) suggest, for example, that the X-Caddis can be taken as much for a mayfly as a caddis fly.

I think, to the extent this happens, the trout are taking the fly as...