How to set the camera to 1x 1?

If you use an ordinary 35mm SLR instead of a medium or large format camera, the aspect ratio of this camera is not 1: 1. General photographers don't set the ratio of 1: 1 when shooting, and most cameras can't set this ratio. First, shoot according to the normal proportion, and pay attention to leaving enough borders for cutting. After shooting, you can cut it in Photoshop or lightroom according to the ratio of 1: 1, which is very convenient to meet the requirements.