1. Subject Distance:
* Closer the subject, smaller the dish can be: This is because the light source effectively becomes larger relative to the subject.
* Further the subject, larger the dish needed: A smaller dish will become more of a point source and produce harsher shadows.
2. Desired Softness and Coverage:
* Smaller dish = Harsher light, more defined shadows: Good for dramatic looks, emphasizing texture, and sometimes sharpening features. Can be unforgiving on skin.
* Larger dish = Softer light, gentler shadows: More flattering for most skin types and helps to smooth imperfections. Creates a more evenly lit image.
3. Full Body vs. Headshots:
* Headshots and Close-Ups: You can usually get away with smaller sizes like 16", 22" or 27".
* Half Body or Full Body: You'll likely want a larger size, like 27" or even 32" and above, to ensure even illumination.
4. Studio Space:
* A larger dish requires more space to back up and get the subject at the desired distance. Consider your studio size when choosing.
5. Modifier Options (Grid and Diffuser):
* Grid: A grid narrows the beam of light, creating more focused, dramatic light. It will generally make a light source *seem* smaller and harsher. This can be useful for adding contrast or controlling spill.
* Diffusion Sock: This softens the light, making it more forgiving. Can make the light more flattering on skin.
General Size Recommendations for Portraits:
* 16" Beauty Dish:
* Pros: Very portable, good for on-location work, can create striking light.
* Cons: Harsher shadows, less forgiving on skin, smaller coverage.
* Best for: Dramatic headshots, emphasizing texture, when you want a more sculpted look.
* 22" Beauty Dish:
* Pros: A good compromise between portability and softness. Versatile size.
* Cons: Can still be somewhat harsh if used too close or without diffusion.
* Best for: Headshots, upper body portraits, general studio use. A popular starting point.
* 27" Beauty Dish:
* Pros: Softer light, more flattering for skin, wider coverage.
* Cons: Less portable, requires more space, may need more power from your strobe.
* Best for: Headshots, upper body portraits, even full body portraits with careful positioning. Great for a more beauty-focused look.
* 32"+ Beauty Dish:
* Pros: Very soft light, excellent for full body portraits and larger groups.
* Cons: Least portable, requires a lot of space and power.
* Best for: Larger studio spaces, full body portraits, high-key lighting scenarios.
Important Considerations:
* Your Style: What kind of portraits do you like to create? Do you prefer dramatic and edgy or soft and flattering? This will guide your choice.
* Versatility: If you can only buy one beauty dish, the 22" or 27" offers the best balance of portability and softness.
* Experiment: The best way to find the right size is to try different sizes and see what works best for you and your subjects. Renting before buying is a good idea.
* Light Falloff: Remember that light falls off quickly. The further the light source is from the subject, the weaker it becomes and the more you will need to adjust your camera settings or light power. Larger beauty dishes can help with this in situations where you need to have the light further away.
* Color Cast: Some beauty dishes, particularly cheaper ones, can introduce a slight color cast. Be aware of this and use your camera's white balance settings or post-processing to correct it.
In summary:
* For a starting point, a 22" beauty dish is a great all-around option.
* For dramatic and edgy looks, go smaller (16" or 22" with a grid).
* For softer and more flattering light, go larger (27" or 32").
Consider your style, subject distance, and available space when making your decision. Good luck!