Lens distortion is something you need to consider every time you take a photo of a face.
Have you ever noticed that sometimes when you photograph your children, their faces in your images look completely different to how they look in real life?
You’re not imagining it, it is happening, there is a reason for it and you can control it.
The reason is lens distortion, and it has the power to change how our subject looks. For this reason, understanding it is crucial so that you can ensure it doesn’t ruin your portraits!
There are two types of distortion – perspective (caused by the distance between subject and lens) and optical (caused by the lens).
Perspective distortion relates entirely to the distance between subject and lens.
Through the naked eye, objects close to our eyes will appear bigger than objects that are further away. This is the case even if the object that is further away is the same size or bigger than the object that is closer to us. Objects that are further away from our eyes will appear to be smaller than they are in reality. This is perspective distortion.
Lenses at the extreme ends will exaggerate perspective, as follows:
Exaggerates size of objects so that they appear larger than they are in reality. The closer the object is to the lens, the more size distorted it becomes.
Exaggerates distance by stretching and elongating. So objects appear to be further away than they are in reality. Also exaggerates distance between objects.
Perfect for shooting landscapes for sweeping skies and wide vistas.
Makes objects appear to be closer than they are in real life, reduces the distance between objects, and will compress them so they appear narrower or thinner.
Perfect for wildlife and sport photography, and portraits (up to around 200mm).
So what does this all mean when photographing faces?
You end up with features closest to the lens looking disproportionate to features that are further away from the lens. In other words… small head, big nose and forehead! Additionally, the stretching effect will flatten faces. If hands or feet are extended toward the lens, they will also appear to be disproportionately bigger than the rest of their features.
You can see in this example how the different lens lengths are affecting her face.
The wide angle lenses when you’re in really close (image on the right, taken at 12mm) are nowhere near as flattering as the longer focal lengths when you’re standing further away (image on the left – taken at 135mm).
The compression seen with telephoto lenses has the effect of shortening faces. You’ll see this in evidence in the series of shots below – notice how her face shape is getting shorter as the focal length gets longer.
Up to 135mm the effect is not overly distortive. However beyond this focal length (and sometimes even at or before if your subject already has a square face) the effect will not be desirable.
So if your subject has a rather square face, you should take that into consideration when choosing to use a long lens.
The best way to increase your confidence in knowing which is the best gear to use to create the portraits you desire… is to start playing!
Zoom your lenses in and out, take different shots and pay attention to how the images change.
The more familiar you are with the equipment you have, the more you’re in control and can confidently achieve the results you desire!
Related: What Lens Should I Use?
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