1. Every flash photo photograph is two exposure in one
2. fill flash can be when subject is backlit or side lit to eliminate silhouettes or shadow
3. flash exposure is not affected by shutter speed
4. flash illumination is dramatically affected by distance
5. your camera measures ambient light and flash illumination separately
6. With automatic flash metering, the flash illumination is measured after the shutter button is pressed, and the flash output is adjusting accordingly.
7. Every SLR camera with a mechanical shutter box has a max flash sync shutter speed
8. harsh lighting, washed out subjects and red eye can be laminated by using diffusers and light bouncing
9. It is possible to charge the order of when the flash fire using "Rear Curtain Sync"
10. Removing the flash from the top of the camera helps eliminate red eye and unflattering shadows
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