Cat's pupils vary from round under low illumination to tall vertical
slits under bright illumination. The vertical size under bright light
is about 12mm while human pupils reach a maximum dark adapted size of
7mm and close down to about 3mm in bright light. Where a typical flash
shot is being taken the human pupil might be 5mm in diameter and the
cat's be 10mm tall or over twice the physical vertical dimension.
That's problem number one. The second problem is that the cat's eyball
is much smaller than a human's so the angle from the vertical edge of
the pupil to the retina is very much larger in the cat than the human.
To eliminate "red eye" in the shot for people or cats you need to have
the flash separated from the lens at a larger angle than that from the
pupil to the retina.
The solution for shooting flash with the cat is to use much more
separation between flash and lens vertically and also to move the flash
to the side if you can to avoid that vertical slit. I haven't done any
computations here but I suspect strongly that you'll have to get the
flash well off the camera to make it work.
Dr. Flash
Darin wrote:
> Jerry Smith wrote:
>
>> I was visiting a cousin in from Iraq, he's a civilian contractor there, and
>> shot this while playing with the kids. This little fellow is kept very busy
>> running >from the kids. It reminded me of all the computer command post
>> shots from the other
>> week.http://www.flickr.com/photos/proud-texan/3060703211/
>> Jerry
>> Life is not a race, it is a ride. Enjoy it!!
>>
>>
>>
>> http://www.flickr.com/photos/proud-texan/
>>
>
>
> Jerry,
>
> How'd you manage to avoid red eye? Every photo I've ever taken of my cat has
> come out with blazing red demon eyes, though maybe that's just my cats
> personallity showing through. I've tried bounce flash, a diffuser, bounce
> with diffuser, nothing seems to work.
>
> Thanks,
> Darin
>
>
>
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