Which technique is recommended to make an object like a fence disappear in a photograph?

Using the widest aperture and getting as close to the obstruction as possible is the recommended technique for making an object like a fence disappear in a photograph. When you use a wide aperture (a low f-stop number), it creates a shallow depth of field. This means that only a small portion of the image in focus is sharp, while the rest is blurred.

By positioning yourself close to the fence while taking the picture, you maximize this effect. The fence will be out of the depth of field, making it appear blurred and less noticeable in the final image. This technique is effective in isolating the main subject of the photograph, drawing the viewer's attention away from unwanted distractions like the fence.

Other techniques, such as using the shortest focal length, adjusting shutter speed, or taking photos in low light, do not directly influence the depth of field in the same way and are less effective for this specific purpose of minimizing obstructions in the frame.