On Canon SLR Lens

1 18-200 is an APS-C lens, and 70-200 is a Quan Huafu lens. They are all on the APS-C framework, and the remote content is the same. On the Quan Huafu frame, the remote content is the same, but the 18-200 lens has a black imaging circle.

2 50mm 1.4 is called "standard fixed focus" lens. The so-called title has the advantages of small degradation, mature design and close visual angle to human eyes. There is a saying in photography that photography starts at 50 and ends at 50. Many photographers start shooting with a fixed focus of 50, and the most mature works are mostly with a focal length of 50. This shot is very good as a hanging head, and it fits well with humanities, portraits and scenery. However, it should be noted that on Canon aps frame, the actual viewing angle of 50mm is 80, so it is mostly used for portraits and simple humanities, but it is a good choice on Quan Huafu fuselage.

If it's 3 50D, it depends on what you want to shoot next. If it is a landscape, I suggest you consider 17-40 F4, with good wide angle, constant aperture and guaranteed image quality. If it is a portrait, it is 70-200 F2.8 (70-200 F4 is also good) or 85 1.2 and 1352. Macro first consider the new macro of 100mm, which can be said to be the best in Baiwei, and the scenery can also be considered 100-400 ... As for the lens of the branch factory, I don't recommend it. On the one hand, the technology of the branch factory is not as good as that of the original factory, and the imaging is not very good. For example, Longteng 17-50 F2.8, but I found it after using it.