"smcp-A 645 135mm F4 Leaf Shutter The PENTAX smcp-A 645 135mm F4 telephoto leaf shutter is ideal for product photography because of its f/4 maximum aperture. This manual focus lens offers a ...

"The PENTAX smc 67 400mm f/4 ED extreme telephoto lens is designed for use with PENTAX's renowned 67 series medium-format SLR cameras and is ideal for landscape and wildlife photography.