Durn. I guess it would help to include the main link
<http://www.chucknorcutt.com/5D%20moire/>
Chuck Norcutt
Chuck Norcutt wrote:
> I've been shooting with a Canyon 5D for almost 3-1/2 years and have
> never previously seen anything like this... truly severe moiré. I was
> out back testing my gear before this week's bridal shoot. I'm expecting
> that the shot will have to be made at this spot overlooking Lake George
> <http://www.tripadvisor.in/ReviewPhotos-g48016-d572160-r5615464-The_Inn_at_Erlowest-Lake_George_New_York.html#1477336>
> but in late afternoon sun more like you see here which puts the
> background in full sun but the bride in heavy shade.
> <http://www.tripadvisor.in/ReviewPhotos-g48016-d572160-r5615464-The_Inn_at_Erlowest-Lake_George_New_York.html#1477334>
>
> Getting the shot right requires setting the shutter speed within the max
> sync range, and then adjusting aperture for the sunlit background. Then
> the flash power has to be raised on the bride to equal the pre-set
> exposure for the background brightness and bring her out of the shadows.
>
> Ignore the fact that the lights aren't really set correctly yet but
> check what happens to my shirt on close-up inspection. Note the two
> "bulls-eye" moiré patterns centered where the lights are aimed. I'm not
> sure if the lights are in any way responsible for this. The pattern in
> the fabric where the blue and tan moiré pattern appears (there is no
> blue in the shirt) is a very fine vertical and horizontal pattern of
> brown lines enclosing small white squares about 1mm on a side. Such a
> happenstance on a bridal gown would be deadly.
>
> Film, of course, wouldn't have such a problem... at least until you got
> to the scanner. But I wouldn't be able to take this shot with an OM
> either. The exposure was ISO 200 at 1/200 second at f/11. An OM would
> have required much slower ISO or enough ND filtration to stay within the
> sync speed that I wouldn't have enough flash power to punch through it.
> I think I'm gonna take the Mynolta A1 along with me just in case.
> That camera makes flash work even easier since it can sync at just about
> any speed. At 1/500 or 1/640 I could open the aperture enough to be be
> able to use some T32s, even with diffusers.
>
> Chuck Norcutt
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