Quite possibly. The rule of thumb for prevention of red-eye is to
separate the flash from the optical axis of the lens by 1/20 of the
distance to the subject. 1/20 of 50 feet is 2-1/2 feet which isn't going
to be possible... at least not vertically. But the flash will be
separated by that much and more horizontally for most everyone in the
field of view except for a few subjects in the center. If there is
red-eye I can handle that easily. I can't handle blurring due to
subject motion on long exposures at high magnification.
Chuck Norcutt
On 6/21/2012 5:46 PM, Jez Cunningham wrote:
> With direct, camera-mounted flash and telephoto lens, red-eye will be
> the worst possible...
>
> Jez
>
> On 20/06/2012, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>> I've been re-thinking your use of flash comment. Since I've been ending
>> up near the back of the auditorium anyway I think I'll just stand in the
>> back where I won't bother anyone. I'll put the camera on a monopod and
>> use camera mounted flash. I can try bounce (which I don't think will
>> work given the distance and ceiling) but I can always fall back on
>> direct flash with the zoom head set for 105mm. Some light will be
>> better than none and 1600 might work. You'd think I'd be more
>> knowledgeable and better prepared having been there twice already. :-)
>>
>> Chuck Norcutt
>>
>>
>> On 6/20/2012 11:51 AM, Ken Norton wrote:
>>>> My granddaughter's high school graduation is this weekend and I'm
>>>> dreading it photographically. There's no practical way I can do flash
>>>> photography in the auditorium where it will be held and even the 5D's
>>>> 3600 ISO isn't really adequate for the poor lighting there. Oh, well.
>>>
>>> Piece of cake, Chuck. I wouldn't fear about that at all. ISO 1600 and
>>> your flash even bounced will do it, unless you are all the way back in
>>> the cheep seats.
>>>
>>
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