Re: [OM] Seat warmer

[Darin]

Chuck Norcutt wrote:


> 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
>

Thanks for the technical info Dr. Flash, I''ll try holding the flash out at 
arms length next time and see if that does the trick. Would you recommend 
holding it straight out to the side, straight up, or a combo of the two?

Darin 

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