I bought it to help the whale 18-105 for the Nikon D5100, it suits everyone, the back and front focus are normal, unlike the whale, you can shoot in low light, take a photo for yourself, now the season is starting, so I bought it, chose different 50mm options, considered the Soviet helios 81H, 1.8 nikor with and without AF-S, decided not to save money and took 1.4G, a photograph of my cat, lighting two energy-saving lamps of 25W each