Further to the last digital standard zoom shootout carried out by the ERPhotoReview, I think the author's last group test amongst six 50mm lenses is also worth mentioning:-http://erphotoreview.com/wordpress/?p=243This test is yet quite interesting as the Takumar 55/1.8, Pentax A 50/1.4 and Pentax F 50/1.7 each represents the well-established optical formula and design of each own, which have been
