The professional cameras Finch Fotography uses takes pictures that are a 2:3 ratio in size. So if you order a 4×6 print, which is a 2:3 ratio, none of the picture will be cropped. If you order other sizes that are NOT a 2:3 ratio, such as a 5×7 or 8×10, parts of the picture will necessarily be removed when it is cropped to that size.
Here are some images to help you understand:
