Wow! That is so cool ... Too bad they are so spendy. I'd hate to think what they's cost for a 49mm or 58mm size.
Shel > [Original Message] > From: William Robb > A notch filter is a narrow band rejection filter. They reject a certain > frequency while passing all others. > Sadly, they are bloody expensive, and not very big around. > http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=2432 > > William Robb >
