1. The Look You're Going For:
* Smaller Beauty Dishes (16-22 inches):
* More Specular Light: Produce harder light with more contrast and pronounced shadows. Great for emphasizing texture and creating a more dramatic or edgy look. Highlight skin imperfections more, so be mindful of retouching needs.
* Faster Fall-off: Light falls off quickly, making them ideal for solo portraits where you want the background to fade to darker tones.
* More Portable: Easier to transport and use in smaller spaces.
* Larger Beauty Dishes (23-32 inches and up):
* Softer Light: Provide a softer, more flattering light that minimizes blemishes and creates smoother skin tones.
* Slower Fall-off: Light wraps around the subject more evenly, making them better for group portraits or when you want to illuminate more of the background.
* Less Portable: Can be cumbersome to transport and require more space to use.
* More Forgiving: Easier to work with for beginners as the light is less harsh.
2. Subject Distance:
* Close-Up Portraits (Headshots, Tight Shoulders-Up):
* Smaller to Medium (16-28 inches): Smaller dishes provide enough softness without being too large and unwieldy. A smaller dish allows you to control the light more precisely when working in close quarters. Even a 16" or 22" can create beautifully soft light at close range.
* Medium Portraits (Waist-Up):
* Medium to Large (22-32 inches): A larger beauty dish is a good choice as you'll need more light to cover the larger area and maintain soft, flattering light.
* Full-Length Portraits:
* Large (28 inches and up): You'll definitely want a larger beauty dish to ensure the entire body is evenly lit and to create a softer, more pleasing look.
3. Shooting Space:
* Small Studios or On-Location: A smaller beauty dish is generally preferred as it's more manageable in tight spaces.
* Larger Studios: You have more flexibility to use larger beauty dishes.
4. Subject's Skin and Features:
* Young Skin: You can often get away with a smaller, harder light source.
* Mature Skin: Softer light from a larger beauty dish is generally more flattering as it minimizes wrinkles and imperfections.
* Male Subjects: Harder light from a smaller beauty dish can emphasize masculine features (jawline, bone structure).
* Female Subjects: Softer light is often preferred for a more traditionally "beautiful" look.
5. Personal Preference:
* Ultimately, the best size beauty dish for you depends on your personal style and the specific look you're trying to achieve. Experiment with different sizes and modifier combinations to find what works best for you.
General Guidelines:
* 22-inch: A good starting point and considered a versatile size for a variety of portrait styles.
* 28-inch: Another very popular choice, offering a balance between softness and control.
Important Considerations:
* Grid vs. No Grid: Adding a grid to your beauty dish will narrow the beam of light, increase contrast, and prevent light from spilling onto the background. Grids make the light harder overall. Very useful when you need very directional light.
* Diffusion Sock: Adding a diffusion sock over the beauty dish will further soften the light and reduce specular highlights.
* Material (White vs. Silver):
* White: Softer, more even light. A good choice for beginners.
* Silver: Higher output, more contrast, and a slightly more specular light. Requires more control.
* Distance: The distance between the beauty dish and your subject also impacts the softness of the light. The closer the light source, the softer the light.
Recommendations for Starting Out:
If you're just starting out, a 22-inch or 28-inch white beauty dish is a good choice as it's versatile and easy to work with. Experiment with different positions and modifiers to see how the light changes and how it affects your portraits.
Ultimately, the best way to choose the right beauty dish is to experiment and see what works best for you and the type of portraits you want to create. Don't be afraid to rent different sizes before investing in your own.