Re: [Utah-astronomy] How do colored planetary filters work?

Chuck wrote:

I don't doubt at all that colors similar to the filter *appear* lighter, BUT- It's a contrast illusion. . . . The filter does not increase flux . . .

Good clarification. Yes, there's no question that we are discussing psychological color perception and not increases in luminance flux. - Kurt _______________________________________________ Sent via CSolutions - http://www.csolutions.net