Shorter Focal Lengths (e.g., 24mm, 35mm, 50mm - on a full-frame camera):
* Perspective Distortion: These lenses exaggerate perspective. The parts of the face closest to the camera appear larger, while the parts further away appear smaller.
* Facial Features:
* Nose: Can appear larger and more prominent.
* Forehead: May seem wider.
* Ears: Recede further and appear smaller.
* Jawline: Can be distorted, potentially appearing wider or less defined.
* Overall Impression: Tends to make faces look wider, rounder, and sometimes caricatured.
* Working Distance: You need to be much closer to the subject to get a headshot. This intimacy can be beneficial for candid shots but can also make the subject feel uncomfortable.
* Background Inclusion: Captures a wider field of view, including more of the background. This can be useful for environmental portraits.
Ideal Uses for Shorter Focal Lengths:
* Environmental Portraits: Showing the subject in their context.
* Candid Shots: Capturing natural expressions, although you need to be close.
* Creative Distortion: Intentionally using the distortion for artistic effect.
"Normal" Focal Lengths (e.g., 50mm - on a full-frame camera):
* Perspective: Close to how we perceive the world with our own eyes. Less distortion than shorter focal lengths.
* Facial Features: Proportions are generally accurate and balanced.
* Working Distance: A comfortable distance for both photographer and subject.
* Background Inclusion: Balances subject and background.
Ideal Uses for "Normal" Focal Lengths:
* General Portraiture: A good starting point for learning.
* Everyday Portraits: Capturing a natural and realistic look.
Longer Focal Lengths (e.g., 85mm, 100mm, 135mm, 200mm+ - on a full-frame camera):
* Perspective Compression: These lenses compress perspective, making objects in the foreground and background appear closer together.
* Facial Features:
* Nose: Appears smaller and less prominent.
* Depth: Decreased depth of field blurs background and draws viewer to the subject.
* Flattening: Can flatten the face somewhat, minimizing the prominence of features.
* Jawline: Tends to look sharper and more defined.
* Overall Impression: Generally considered more flattering, often making faces appear slimmer and more elegant.
* Working Distance: You need to be further away from the subject to get a headshot. This can make the subject feel less self-conscious.
* Background Separation: Creates a shallow depth of field, blurring the background and isolating the subject.
Ideal Uses for Longer Focal Lengths:
* Classic Portraits: Flattering and professional-looking portraits.
* Close-Up Headshots: Isolating the subject and emphasizing their eyes.
* Portraits with Blurred Backgrounds: Creating a dreamy and artistic look.
* Subjects who are self-conscious about their nose: The compression minimizes its size.
Key Takeaways and Considerations:
* Focal Length is Intertwined with Distance: The focal length you choose dictates the distance you need to be from your subject to achieve a desired framing. It's the *distance* that directly affects the perspective and distortion. Changing the focal length without changing your position doesn't alter perspective.
* Aperture and Depth of Field: Longer focal lengths, especially when combined with wide apertures (e.g., f/1.8, f/2.8), produce a very shallow depth of field, which is great for isolating the subject but requires careful focusing.
* Full-Frame vs. Crop Sensor: The "effective" focal length changes based on the sensor size of your camera. For example, a 50mm lens on a crop sensor camera (with a crop factor of 1.5x) will have an effective focal length of 75mm (50mm x 1.5).
* Personal Preference: There's no single "best" focal length for portraits. It depends on your style, the subject's features, and the desired effect.
* Experimentation is Key: Try different focal lengths and see how they affect your portraits. Pay attention to the perspective and the way the light falls on your subject's face.
In Summary:
Choosing the right focal length is crucial for achieving the desired look in portraiture. Shorter focal lengths offer a wider view and can create dramatic distortion, while longer focal lengths compress perspective and offer a more flattering representation of the face. Understanding these effects will allow you to make informed decisions and create compelling portraits.