How Sharp Is the Fujifilm XF 400mm f/4.5 on the X-T50?
Fujifilm's XF 400mm f/4.5 gives X-mount shooters the field of view of a 600mm lens on full frame, with an aperture about two-thirds of a stop brighter than the company's 500mm f/5.6. If you shoot birds or wildlife on Fujifilm, that extra light can be the difference between a usable shutter speed at dawn and a frame lost to motion blur.