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Re: [OM] Seat warmer

Subject: Re: [OM] Seat warmer
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 26 Nov 2008 17:35:23 -0500
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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