Preventing Red Eye with on camera flash.

Discussion in 'Beyond the Basics' started by Garbz, Jan 4, 2006.

  1. Garbz

    Garbz No longer a newbie, moving up!

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    Is there any easy way to prevent red-eye photos? The red-eye reduction in modern cameras what does that do? I assume it makes people glare into the flash as apposed to the lense. By this logic eliminating redeyes should be as easy as getting people to focus somewhere beside the camera?
     
  2. dsp921

    dsp921 TPF Noob!

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    Red-eye reduction triggers the flash a few times before the picture is taken, that is supposed to close the pupils and eliminate the reflection of the flash from the back of the eye. Works OK most of the time. It's more of a problem with on-board flashes since the flash is close to the lens it bounces back more directly to the lens. Only problem is that some people think the picture has been taken when the flash strobes and they move...
     
  3. Revel

    Revel TPF Noob!

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    The red eye reduction in modern cameras. I believe that the flash fires of several flashes which causes the pupils in the eye to dilate ( narrow ) thus reducing the risk of light bouncing off the back of the eye. This is my understanding, but im sure somebody will know for sure.
     
  4. Revel

    Revel TPF Noob!

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    bugger, somebody can type quicker than me :lmao:
     
  5. Garbz

    Garbz No longer a newbie, moving up!

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    dilate means to widen :) but I know what you mean. Ithought it may have had something to do with where people were looking. Oh well.
     
  6. Revel

    Revel TPF Noob!

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    I realised after I posted it was wrong. I left the ambulance service in 2001 and things start to get a little rusty. Thank god I still know what a myocardioinfarction is :lmao:
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    I think you mean "myocardial infarction" :p lol. Heart attacks :)
     
  8. ajmall

    ajmall TPF Noob!

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    the problem i find is that it doesn't get rid of red eye, it only reduces it. I'm not happy with ANY photos that have either a small amount of red eye or a large amount....
     
  9. Rob

    Rob TPF Noob!

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    Redeye is caused by the flash illuminating the blood cells at the back of the eye (retina wall) and can be avoided by three main methods:

    Rapid successional flash - usually called red-eye reduction - this closes the pupil making the red circle smaller.

    Diffuse soft flash - using a Rizla or crepe paper to create a small soft box light instead of a hard flash.

    Moving the flash away from the lens - this is the best method as it prevents a direct reflection from the back of the eye to the lens. The best two ways to achieve this are with a tilt-head flash and bounce off a reflector or the ceiling, or my preferred method of using a PC lead to take the flash off camera completely.

    Hope this helps!

    Rob
     
  10. ajmall

    ajmall TPF Noob!

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    ahh rizla paper! i've never thought of that one! genius
     
  11. DLL_4ever

    DLL_4ever TPF Noob!

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    How come i never get a red eye when i take close-up photos of my eyeball? Even when the redeye reduction is turned off, it still turns out perfectly normal:

    [​IMG]
     
  12. Revel

    Revel TPF Noob!

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    lol. now you know why im not a medic any more.:lmao:
     

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