A ring flash is a circular photographic electronic flash that fits around a camera lens.
- Continuously-variable focal length – suitable for virtually all macro subjects
- 45–65 mm – product photography, small objects that can be approached closely without causing undesirable influence, and scenes requiring natural background perspective
- 90–105 mm – insects, flowers, and small objects from a comfortable distance
- 150–200 mm – insects and other small animals where additional working distance is required
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