1. Desired Look:
* Smaller Beauty Dish (16-22 inches):
* Pros: Creates a more contrasty, sculpted look with sharper shadows. The light source is smaller, leading to more defined shadows. More portable and easier to maneuver in smaller spaces.
* Cons: Can be harsher on the skin if used without a diffuser. Might require a reflector for fill light in the shadows, especially for full-body shots. More likely to show imperfections on skin without careful positioning or diffusion.
* Best For: Dramatically lit portraits, editorial, beauty shots where a more "hard" look is desired, emphasizing bone structure. Good for close-up headshots and tighter crops.
* Larger Beauty Dish (23-32 inches):
* Pros: Creates softer, more flattering light with gentler shadows. Offers better coverage for full-body shots. More forgiving on skin, minimizes imperfections, and provides a smoother overall look. Can be used without diffusion in many situations.
* Cons: Less contrasty, can appear flatter if not used carefully. Less portable and harder to maneuver. May require a more powerful strobe to compensate for the larger light source.
* Best For: Classic portraiture, softer beauty shots, full-body portraits, and situations where a more natural, flattering light is preferred.
2. Subject Distance:
* Closer to the Subject: Smaller beauty dishes are often preferable when you're shooting close-up headshots. The smaller size helps focus the light and create more defined shadows.
* Further from the Subject: Larger beauty dishes provide wider coverage and softer light when you're shooting full-body portraits or need to light a larger area.
3. Shooting Space:
* Small Studio/Space: A smaller beauty dish is easier to manage and position in a confined space.
* Large Studio/Space: You have more flexibility with larger beauty dishes, but be mindful of needing more power to fill the space.
4. Modifiers:
* Diffuser Sock: Adding a diffuser sock to a beauty dish softens the light and reduces contrast. This is useful for softening the shadows from a smaller beauty dish or further softening the light from a larger one.
* Grid: A grid narrows the beam of light, creating more controlled and directional light. This can be helpful for adding drama or isolating specific areas of the subject.
5. Strobe Power:
* A larger beauty dish requires more power from your strobe to achieve the same exposure as a smaller one. Ensure your strobe is powerful enough to handle the larger light modifier, especially when shooting in environments with ambient light.
Here's a quick guide based on common portrait scenarios:
* Headshots (Close-up): 16-22 inch beauty dish (consider a diffuser if you want a softer look)
* Shoulder-Up Portraits: 22-27 inch beauty dish
* Half-Body Portraits: 27-32 inch beauty dish
* Full-Body Portraits: 28-32 inch beauty dish (or larger, especially if used further away)
General Recommendations:
* If you're just starting out and can only afford one: A 22-27 inch beauty dish is a versatile size that can work well for a variety of portrait styles. Adding a diffuser sock increases its flexibility.
* Consider your "style": Do you prefer a more dramatic, sculpted look or a softer, more flattering look? Let that guide your decision.
* Rent or borrow before you buy: If possible, try different sizes to see what works best for you.
* Experiment! The best way to find the right size beauty dish is to experiment with different sizes and modifiers to see what produces the results you want. Don't be afraid to break the rules and find what works best for your individual style.
Beyond Size: Other Factors to Consider:
* Color: Most beauty dishes are white or silver. White beauty dishes produce softer light, while silver beauty dishes produce more specular, contrasty light.
* Shape: Beauty dishes can be round or octagonal. Octagonal beauty dishes tend to produce more natural-looking catchlights in the eyes.
* Material: The material used in the reflector affects light quality. Aluminum is common and provides good reflectivity.
Ultimately, the best size beauty dish for you depends on your individual preferences, the type of portraits you shoot, and the available space. Good luck finding the perfect beauty dish for your needs!