Factoring the Crop (See Description)
Here's a picture whose EXIF I have stripped so you won't know what equipment was used to shoot it.
If you had to guess the sensor size, considering that this is a minimally edited photo, what would be your guess? FX? DX? m43? 1"? 1/1.7"? 1/2.3"?
Click through to photos.t9i.in/2016/08/factoring-the-crop/ for the answer.