Big y photography is playing.

The following answers, Y is correct, N is wrong, and there are explanations behind, I hope it will help you.

16. In order to avoid linear distortion when shooting tall buildings, the back of the camera should be parallel to the front of the building.

Y When the lens is unchanged, if the back of the machine is parallel to the building, the convergence of parallel lines caused by linear distortion can be suppressed to the maximum extent.

17. For a typical SLR camera, framing makes the lens always open the aperture to the maximum, and the brightest image has been obtained, even if the lens is set at the smaller aperture required for shooting.

Y Typical SLR cameras have the maximum aperture when shooting, so that there is enough light to shoot. Setting the aperture will only shrink at the moment of shooting.

18. When shooting portraits, the best focus is the nose tip of the subject.

N eyes are the first choice.

19. For a certain lens, the depth of field of f/ 1 1 is greater than f/4.

Y other parameters remain unchanged, the smaller the aperture, the greater the depth of field.

20. For a lens, the depth of field when focusing 20 feet is greater than that when focusing 10 feet.

The hyperfocal distance of the N super wide-angle lens is very close, and the depth of field is the same in this case.

2 1. For most apertures and medium shooting distances, the depth of field extends to the same distance before and after the focus.

The range of depth of field extends forward by 1/3 and backward by 2/3.

22. All points in the depth of field are equally clear from front to back.

N focus is the clearest, and the farther away from the focus, the less clear it is. The depth of field is only the definition range acceptable to human eyes.

23. When you look through the SLR viewfinder, the depth of field you see is always exactly the same as that recorded on the film.

When shooting, half the aperture of the camera is opened to the maximum. If you set a different aperture, the depth of field will be different from that observed.

24. The focal length at which the maximum possible depth of field can be obtained is called hyperfocal distance.

Hyperfocal distance's definition is this.

25. SLR cameras are usually equipped with focal plane shutters.

One of the basic design elements of Y SLR.

26. Shooting an object moving towards the camera with a slow shutter speed can still maintain considerable clarity compared with the same object moving from left to right through the field of view.

N Moving an object from left to right requires a faster shutter than moving it towards the camera.

27. When shooting distant mountain scenes, if you hold a camera and use the shutter speed of at least 1/60 seconds, you can always get satisfactory and clear images.

N It is generally recommended to use the shutter with reciprocal focal length as the lower limit of hand-held safety shutter. For example, 70mm needs to be faster than the shutter of 1/70 to be safe.

28. Using a very high shutter speed can make the water look like a line or a "pointer" of light. Use a slower shutter.

29. When shooting with a hand-held camera, when the shutter speed is1100 seconds or higher, you can always get quite clear images.

N depends on the focal length of the lens, please refer to the explanation in question 27. For example, with a 300mm lens, the shutter of1100 cannot be guaranteed.

30. Using skylight will not cause image loss.

N will definitely be damaged. The skylight itself is colored, and shooting will cause color difference.