Lightweight and responsive, the 45mm f4 SMC is a lens waiting to become the expediter of your photographic dreams. With a scope broad enough to encompass the most creative photographic vision, you'll have the optical tool you need to produce countless, inspired wide-angle masterpieces. To make sure your images are bright, clear, sharp, rich and true in color and free from flare and ghosting, the 45mm f4 is manufactured by Pentax with their exclusive Super-Multi-Coating (SMC) which transmits 99.8%of incident light.