Canon 17-40f4 or 16-35, which is more worthwhile?

Both are wide-angle lenses with red circles. The maximum aperture of 17-40 is F4, and the maximum aperture of 16-35 is F2.8 Besides the different aperture, different materials and workmanship, the imaging quality is also different. 16-35 is better than 17-40, and the price is different. Recommended 16-35, used all the time, very good.

Precautions for using wide-angle lens:

1, the scene shot by wide-angle lens is near big and far small, and the perspective effect is exaggerated. The closer the subject is to the camera, the more obvious the exaggeration becomes. Therefore, when taking portraits, people should not be too close to the camera, otherwise it is easy to take deformed photos of "fat nose and mouse ears". Of course, the works of art shot with this effect are excluded, such as The Hand Holding the Vote, which is a very famous photo.

When shooting a building with a wide-angle lens, the lens tilts up or down, which makes it easy for the parallel lines of the building edge contour to shrink or intersect in the distance. Pay attention to choose the contraction point on the center line of the framing picture, otherwise it will easily skew the building image and give people the illusion of collapse.

2. When a wide-angle lens uses a hood or a color filter, it is easy to block the periphery of the lens viewing angle and darken the image field. This situation is not easy to detect when shooting, but it is obvious in the photo. Therefore, when using accessories, be sure to understand their scope of use from the instructions. If there is no explanation in the manual, you should be more careful when shooting.

3. The flash coverage angle of electronic flash is generally equivalent to the viewing angle of 35mm lens of 135 camera. Therefore, when taking flash photography with a wide-angle lens smaller than 35mm, a diffuser should be added in front of the flash window of the flash. If not, you can wrap a layer of white paper or white handkerchief to increase the flash area.