## Reproduction ratioIn close-up and macro photography, the reproduction ratio (or magnification ratio, magnification factor, magnification) specifies the ratio of the size of an image projected on the film or sensor of a camera, and the size of the subject itself: where Typical examples of reproduction ratios are 1:3 (one-third the original size) and 1:100 (one-hundredth the original size). To obtain the original size of the subject, you simply calculate When a photograph is reproduced in press (e.g., a book or magazine), the reproduction ratio i.e., When the subject and its image are the same size, the reproduction ratio is 1:1. This ratio is where macro photography starts. Examples of higher reproduction ratios are 2:1 (the image is twice the size of the subject, i.e., magnification is 2x) and 5:1 (the image is five times the size of the subject, i.e., the magnification is 5x). When the reproduction ratio is higher than 1:1, it is frequently expressed as an integer or decimal number rather than a fraction. For example, you will almost never see a reproduction ratio expressed as 12:5 or 12/5. Instead, this is expressed as 2.4x, which is much easier to understand. You may read here how to specify the reproduction ratio, and how to record and document it when when taking pictures and publishing them. |