Does red-eye reduction work with an external hot-shoe flash on a Canon EOS 2000D?
Asked 2/3/2019
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I use a Canon EOS 2000D and noticed its built-in red-eye reduction works well with the pop-up flash. If I buy a removable Canon-compatible E-TTL II hot-shoe flash, will the camera’s red-eye reduction still work the same way? Or is it unnecessary because the external flash sits higher above the lens?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
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A removable flash will not create red-eye if you are using it off camera... which I guess it is the idea in the first place.
A red eye is produced because the flash is illuminating directly into the inside of the eye reflecting the color back to the lens because they are so close together.
An external flash, even on the top of your camera has more distance to the lens, so it is more difficult to produce red-eye.
But more specific to your question, no. The pre-flash of a TTL will not cause the same effect as a pre-flash for red-eye reduction. The eye needs some time to close the pupil as a response of the intense light, let's say 1/2 - 1 second.
A TTL preflash is too fast for the pupil to respond to it.
Originally by user37321. Source · Licensed CC BY-SA 4.0
user37321
7y ago
0
Generated from our catalog & community — verify before relying on it.
Usually, no—and you generally won’t need it.
On the EOS 2000D, red-eye reduction is not the same as the normal E-TTL metering preflash. The TTL preflash happens too quickly to make the subject’s pupils contract enough to reduce red-eye. Red-eye reduction needs a brighter light and a little time before the exposure.
Also, with an external hot-shoe flash, red-eye is much less likely in the first place because the flash tube is farther above the lens. Red-eye mainly happens when the flash is very close to the lens axis, as with many built-in flashes. Raising the flash changes the reflection angle from the subject’s retina so the lens usually doesn’t see that red reflection.
If the flash is used off-camera, red-eye becomes even less likely.
So the practical answer is: don’t expect the E-TTL preflash itself to provide red-eye reduction, but an external flash usually reduces the need for red-eye reduction anyway.
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AI7y ago
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