Shorter Focal Lengths (e.g., 24mm, 35mm, 50mm):
* Wider Field of View: Captures more of the background and surrounding environment.
* Perspective Distortion:
* Exaggerates Features: Makes features closer to the camera appear larger than features further away. For example, the nose might look larger, and the forehead might appear more prominent.
* Stretches the Face: Especially at very wide angles (24mm or less), the edges of the face can get stretched or distorted. The sides of the face can seem to recede more than they actually do.
* Curves Straight Lines (at very wide angles): Straight lines near the edges of the frame can appear curved, adding to the distortion.
* Sense of Presence: Since you have to be closer to the subject to frame the face, the viewer might feel more intimately connected to the person in the photograph.
* Good for Environmental Portraits: The wide field of view allows you to include the surroundings and tell a story about the subject's environment.
* Challenges: Can be unflattering for close-up portraits due to the potential for distortion. It requires careful posing and consideration of the subject's features.
"Normal" Focal Length (e.g., 50mm):
* "Normal" Perspective: Closely mimics how the human eye perceives proportions at a comfortable viewing distance.
* Minimal Distortion: Less perspective distortion than wider lenses. Features appear more proportional and natural.
* Versatile: Can be used for both close-up and medium portraits.
* Requires More Working Distance: You have to stand further back than you would with a wide-angle lens to frame the face.
* Good Starting Point: A 50mm lens is a good general-purpose lens for portraiture, allowing you to learn about lighting and composition without significant distortion.
Longer Focal Lengths (e.g., 85mm, 100mm, 135mm, 200mm):
* Narrower Field of View: Compresses the background and isolates the subject.
* Perspective Compression:
* Flattens the Face: Brings features closer together and makes the face appear narrower and flatter. The distance between the nose and ears seems less pronounced.
* Reduces Distortion: Minimizes perspective distortion, leading to more natural and flattering portraits.
* Brings Background Closer: Makes the background appear closer to the subject than it actually is.
* Creates Bokeh: Produces a shallow depth of field, blurring the background and further isolating the subject.
* Increased Working Distance: Requires you to stand further back from the subject. This can make some subjects feel more relaxed since you're not "in their face."
* Good for Close-up Portraits: Ideal for flattering portraits where the subject's features are emphasized.
* Can Feel Detached: The distance can sometimes make the viewer feel slightly less connected to the subject.
* Challenges: Requires more space to work in. Can sometimes overly compress features, leading to a lack of dimensionality.
Here's a simple analogy:
Imagine a rubber ball with a face drawn on it.
* Wide-angle lens: You're holding the ball very close to your eye. The nose (nearest part) looks huge, the ears look tiny, and the whole ball appears stretched.
* "Normal" lens: You're holding the ball at arm's length. The proportions are relatively normal.
* Telephoto lens: You're holding the ball far away. The nose and ears look about the same size, and the ball looks flatter.
Key Considerations for Choosing a Focal Length:
* Desired Effect: Do you want to emphasize the environment, create a sense of intimacy, or flatter the subject's features?
* Subject's Face Shape: Some focal lengths are more flattering for certain face shapes. For example, a longer focal length can be flattering for someone with a round face, while a wider lens might work well for someone with a very narrow face.
* Shooting Environment: Do you have enough space to move around? Are you shooting indoors or outdoors?
* Personal Preference: Experiment with different focal lengths to see what works best for you and your style.
In summary:
* Wide angles (short focal lengths): Distort, exaggerate, include environment, intimate feel.
* "Normal" lens (around 50mm): Minimal distortion, versatile.
* Telephoto lenses (long focal lengths): Compress, flatten, isolate subject, flattering, bokeh.
Understanding how focal length affects facial features is crucial for creating compelling and flattering portraits. Experiment with different lenses and distances to find the look that you prefer and that best represents your subject. Remember that there are no hard rules, and the "best" focal length depends on the individual and the desired aesthetic.