I'm going to shoot three sets of contrast homework with SLR now. Aperture affects the depth of field, but the contrast between light and dark should not be too big, focal length affects the depth of f

I'm going to shoot three sets of contrast homework with SLR now. Aperture affects the depth of field, but the contrast between light and dark should not be too big, focal length affects the depth of field, and the shooting of focused objects affects it. Shooting with camera M can fix the position, the same focal length, a set of high-speed shutter with large aperture and a set of low-speed shutter with small aperture, which means that aperture affects the depth of field, but there is little difference between light and dark.

The focal length affects the depth of field. All parameters remain unchanged, and the composition subject remains unchanged. The difference in depth of field is obtained by shooting the widest lens and the longest focal length.

Focus on the object, send two coke bottles, and arrange them at a little distance, which is almost the same as the straight line of the bottles, with an angle of about 45 degrees. Open the aperture to focus on the first bottle and focus on the second bottle, and you can see the effect of depth of field change.