Factors to Consider:
* Working Distance: How far away will the beauty dish be from your subject?
* Desired Softness: How soft do you want the light to be?
* Subject Size: Are you shooting headshots, 3/4 portraits, or full-body?
* Space Constraints: How much space do you have in your studio or location?
* Aesthetic Preferences: Do you prefer a more dramatic or a softer look?
* Power of Your Strobe: Smaller beauty dishes may require less power. Larger beauty dishes will require more power, especially with diffusion socks or grids.
* Modifier Style: Hard beauty dish, diffused beauty dish, or gridded beauty dish? These alter the light quality significantly.
General Guidelines by Size:
* 16-22 inches (Small):
* Pros:
* Very portable and lightweight.
* Easy to manage and maneuver.
* Good for headshots and tight crops.
* Provides a more focused and concentrated light.
* More contrast and dramatic shadows.
* Can be used effectively in smaller spaces.
* Requires less power from your strobe.
* Cons:
* Can be too harsh for some skin types, emphasizing imperfections.
* Less forgiving if your strobe is too powerful
* Less wrap-around light; less flattering for wider shots.
* More prone to creating hard shadows.
* Falloff can be very rapid.
* Use Cases:
* Dramatic portraits with defined features.
* Headshots where sharpness and detail are desired.
* Portraits in tight spaces.
* Adding a touch of edginess or mood.
* 23-28 inches (Medium - Most Popular):
* Pros:
* A good balance between softness and control.
* Versatile for headshots, 3/4 portraits, and even some full-body shots.
* Provides a pleasing light that flatters most skin types.
* Reasonably portable.
* Offers a good balance between light spread and falloff.
* Great "sweet spot" that offers both punch and pleasing rendering.
* Cons:
* May be too large for very tight spaces.
* Requires a bit more power than smaller beauty dishes.
* Use Cases:
* General portrait work.
* Beauty and fashion photography.
* Headshots and 3/4 portraits with soft, flattering light.
* Shooting with a variety of subject distances.
* 29-36 inches (Large) and up:
* Pros:
* Provides the softest light of all beauty dish sizes.
* Excellent for full-body portraits and group shots.
* Offers a wide spread of light, reducing the need for fill light.
* Very flattering for most skin types.
* Very forgiving to minor lighting imperfections.
* Smooth, even coverage on larger subjects.
* Cons:
* Less portable and more difficult to maneuver.
* Requires a good amount of power from your strobe.
* Takes up a significant amount of space.
* Falloff can be less pronounced, leading to a flatter look if not controlled.
* Can be harder to control the direction of the light.
* Light is less direct, and can appear to wrap around the subject, losing edge definition.
* Use Cases:
* Full-body fashion and editorial work.
* Beauty photography where soft, even lighting is paramount.
* Group portraits.
* Situations where you need a large, soft light source.
* When you are very close to the subject.
Beyond Size: Other Important Considerations
* Color: White, Silver, Gold, and other colors affect the light's temperature and characteristics.
* White: Softest, most natural light. Good for general use.
* Silver: More specular and contrasty light. Good for a punchier, more dramatic look. Can be too harsh for some.
* Gold: Warmer, more golden light. Can be used for a more radiant look but can also be too much.
* Internal Deflector Plate: The shape and material of the deflector plate greatly influence the light quality. Some plates are flat, others are curved. Some are white, others are silver. The flatter the deflector, the harsher the light. White deflectors soften the light compared to silver deflectors.
* Diffusion Sock: Adding a diffusion sock to any beauty dish will soften the light and reduce contrast.
* Grids: Grids help to control the direction and spread of the light. They create a more focused beam and prevent light from spilling onto the background.
* Honeycomb Grids Honeycomb grids can be a good choice when you want to limit light spread, such as when you need to highlight specific facial features and avoid spill onto backgrounds.
* Beauty Dish Shape: Beauty dishes are usually either round or octagonal. Octagonal beauty dishes can create a more natural-looking catchlight in the eyes.
Recommendation:
* Beginner: Start with a 22-28 inch white beauty dish. It's a versatile size that offers a good balance of softness and control. A diffusion sock is a good addition.
* Headshots and Tight Spaces: 16-22 inch.
* Versatile Portrait Work: 23-28 inch.
* Full Body and Softest Light: 29-36 inch or larger.
Experimentation is Key:
The best way to determine the right size beauty dish for your portraits is to experiment with different sizes and configurations. Consider renting or borrowing different options to see what works best for your style and needs. Don't be afraid to modify the light with diffusion or grids to achieve the desired effect. Ultimately, the best beauty dish is the one that helps you create the images you envision.