Shorter Focal Lengths (e.g., 24mm, 35mm, 50mm):
* Wider Perspective: These lenses capture a wider field of view. While this is great for showing context and environment, it can distort facial features.
* Exaggerated Perspective: Objects closer to the camera appear larger, and objects further away appear smaller. This leads to:
* Nose Appears Larger: Since the nose is the closest part of the face to the camera, it can look significantly larger and more prominent.
* Ears Appear Smaller and Set Back: The ears, being further away, shrink in proportion.
* Rounded Face: The overall face can appear rounder and wider than it actually is.
* Flattened Depth: Depth is compressed, making the face appear flatter.
* Less Flattering for Close-Ups: Generally not ideal for tight headshots unless you're going for a very specific, artistic look. Can be used creatively to emphasize certain facial features.
* Good for Environmental Portraits: Excellent for showing the subject in their surroundings and telling a story.
"Normal" Focal Lengths (e.g., 50mm, 85mm on a full-frame camera):
* More Natural Perspective: Offers a relatively natural representation of facial proportions, closest to how we perceive faces in real life.
* Less Distortion: Minimal exaggeration of features.
* Versatile: Can be used for both close-ups and slightly wider shots.
* 85mm is often considered a great starting point for portraiture: It offers a good balance of flattering perspective and manageable working distance.
Longer Focal Lengths (e.g., 85mm, 100mm, 135mm, 200mm and beyond):
* Compressed Perspective: These lenses have a telephoto effect, which compresses the distance between objects in the frame. This leads to:
* Facial Features Appear Flatter: The depth of the face is compressed, making the nose appear less prominent and bringing the ears forward visually.
* Slimming Effect: Can make the face appear narrower and more defined.
* Background Blurring (Bokeh): Longer focal lengths create a shallower depth of field, resulting in beautiful background blur that isolates the subject.
* Flattering for Portraits: Generally considered the most flattering for portraits because they minimize distortion and create a pleasing perspective.
* Working Distance: Requires a greater distance between the photographer and the subject. This can be beneficial as it allows the subject to feel more relaxed and less self-conscious.
* 200mm and beyond can be great for candid portraits: You can capture natural expressions from a distance without intruding.
* Important Note: Be mindful of the "telephoto squeeze," where features can become overly compressed. Experiment to find the right balance.
Key Considerations and Tips:
* Crop Sensor Cameras: The "crop factor" of the camera changes the effective focal length. For example, a 50mm lens on a camera with a 1.5x crop factor will have an effective focal length of 75mm.
* Working Distance: Focal length is tied to working distance. To keep the same framing, you'll need to move closer with a wider lens and further away with a longer lens.
* Subject Comfort: Be aware of how your working distance affects your subject. A longer focal length can be less intimidating because you're further away.
* Experiment: The best way to understand the effects of focal length is to experiment. Take the same portrait at different focal lengths (keeping the framing consistent) and compare the results.
* Artistic Vision: Don't be afraid to break the "rules." While longer focal lengths are generally considered more flattering, wider lenses can be used effectively for creative and stylized portraits.
* Subject's Face Shape: Certain focal lengths may be more flattering for specific face shapes. For example, someone with a naturally round face might benefit from the slimming effect of a longer focal length.
* Lighting: Lighting is always a crucial element. Even the most flattering focal length won't compensate for bad lighting.
In Summary:
The focal length you choose significantly impacts the perceived shape and proportions of a face in a portrait. Understanding these effects allows you to make deliberate choices to create the most flattering and expressive images. Longer focal lengths generally provide a more flattering and natural perspective, while shorter focal lengths can be used creatively for environmental portraits or stylized looks, but require careful consideration to avoid distortion. Always experiment and consider your subject's features and your artistic goals when selecting a focal length.