Received on time and well packaged. Excellent construction, flexible rings and quite well arranged. The fixing ring is made up, strong and gives a good balance. But after a few dozen photos at full aperture and 200 mm, I see that all are blurred! (Nikon D800) Hence test pattern and viewing a large backfocus (30 to 70 mm focal length, about 60 to 200 mm focal length). This checked on 2 boxes (Nikon D 800 and D 700, to remove a defect of the case) Seller contacted, return to Spain for settings Tamron Spain. Areas where the development is done are perfect, excellent even dive to 2.8, the optical part is not involved. It only remains to hope that the setting is well done, the goal is neither damaged or lost during transport. Note: the seller Spanish (DigitalToyShop, Malaga) is very responsive, flawless French, very clear instructions, answers to mails very quickly).
