Nikon D810 Tamron 70-210mm f/4 VS PENTAX-D FA 70-210mm f/4 - IS PENTAX VERSION ANY GOOD? - YouTube
SMC PENTAX-A ZOOM 1: 4 70-210mm. Review from the reader Radozhiva | Happy
Amazon.com : HD PENTAX-D FA 70-210mm F4ED SDM WR: Telephoto zoom lens for DSLR cameras High-performance while maintaing constant f/4 aperture Weather-resistant construction min. focusing distance of 0.95 meters : Electronics
New Pentax-D FA 70-210mm F/4 Brings Big Zoom in Compact Design | Digital Trends