Having read the comments (perhaps advertising) rather enthusiastic on the net, I threw myself into buying this, well qualified by its manufacturer and an unbeatable price. I tested it up with my Pentax K3 and T2 adapter of the brand, primarily in sensitivity, which allowed me with ISO 800 to 1600 to have sufficiently high speeds to prevent camera . If the mechanics are excellent, the focus ring is indeed very nice, the optical quality is absolutely not in the RV. Even in high light (sunlight seafront), the colors are bland and the disastrous dive. At lower focal lengths, I could compare with other goals (100 mm Pentax particular) and conclude that the well had bp of the optics of the lens. Am I came across a wrong number ?? Fortunately, Amazon exemplary return policy allowed me to return it free of charge and without having to justify myself.
