Excerpt: When I first took this filter out of the packaging I thought it was defective and they just sent me the ring. That's how immaculate the glass on this filter is. Screw it onto your lens, leave it on and forget it. It doubles as a protective shield for your lens too. The filter actually does produce noticeably sharper images outdoors where there is a lot of sunlight involved.
Excerpt: These are the best filters I've used to date. <br /><br />They are very clear, tough, great multicoating, doesn't induce flare or ghosting.<br /><br />I have these on almost all my lenses that see outdoor use.