File:Distance times fstop.jpg
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Summary
| Description |
English: The illuminating power of electronic photoflash devices are often measured as guide numbers, which are a composite unit of measure comprising two factors: aperture ratio and distance. Guide numbers may be expressed in either of these units of measure: f-number⋅meters or f-number⋅feet.
Camera: Nikon-Df |
| Date | |
| Source | Own work |
| Author | Greg L |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:38, 14 August 2017 | | 2,722 × 2,358 (2.43 MB) | Greg L | Color balance more blue |
| 04:00, 9 August 2017 |  | 2,722 × 2,358 (2.18 MB) | Greg L | Brightened | |
| 03:48, 5 August 2017 |  | 2,722 × 2,358 (2.27 MB) | Greg L | Cleaned up better | |
| 21:14, 4 August 2017 |  | 2,722 × 2,358 (2.3 MB) | Greg L | Lightness curve adjusted | |
| 19:22, 4 August 2017 |  | 2,722 × 2,358 (3.82 MB) | Greg L | User created page with UploadWizard |
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