What are the key differences between a 17-40mm lens and a 16-35mm lens in terms of focal length and performance?

The key difference between a 17-40mm lens and a 16-35mm lens is the focal length range. The 17-40mm lens has a slightly narrower focal length range compared to the 16-35mm lens. In terms of performance, the 16-35mm lens may offer slightly better image quality and wider angle of view, making it more suitable for landscape and architectural Photography.