Not a bad price for a decent CPL filter with multicoating and a low profile. The 52 ($40), 58 ($50), and 62 ($40) filter sizes are also available although they are more expensive.
Item description: The Hoya Pro1 is digital multi-coated to reduce the appearance of lens flare and ghosting, and also boasts a low profile frame to help avoid vignetting on super wide angle lenses and also hold a lens cap.
difference to those ebay ones?