Hi,
thanks Tom. It seems that I didn't know about this because I've been
shooting slides and using an incident meter for so long.
---
Bob
mailto:[EMAIL PROTECTED]
Monday, May 07, 2001, 12:21:21 AM, you wrote:
> Hi Bob:
> The Sunny-16 rule came about long and long ago, before the
> manufactures removed the the safety factor of about one stop
> that they used in rating the films. That is, film went from
> 200ASA to 400ASA without any change in the emulsion. This
> happened back in the late fifties. For best results you need
> to put that one stop back into the film rating. Thus you
> need to use 1/2 the ASA, or Sunny-11 to get the same results
> as you did back then.
> If you look in something like the film guide book Focal
> Press publishes, you will note most negative films have a
> one stop underexposure rating and a two stop overexposure
> rating. Using the sunny 16 rule your are several times more
> likely to underexpose than over expose. Also the brightest
> sunlight is seldom more than one stop brighter than the
> Sunny 16 predicts, so you only get -in the worst case- one
> stop overexposure, but can get several stops underexposure
> using the Sunny-16 rule.
> That said many modern color negative films have a very wide
> exposure latitude so can take several stops overexposure,
> but most only take one or two stops of underexposure so it
> may be better to shift the exposure a couple of stops with
> film like Kodak MAX. That is, rate it at 200 instead or 800.
> These changes did not apply to slide film because it did not
> have the latitude to allow it, so the Sunny-16 rule still
> applies to it. Though in truth I have underexposed more
> slides than I have overexposed, so I tend to use Sunny-11
> there also. But, I usually use an incident meter and that is
> far more accurate than any rule of thumb.
> In the case of the original poster, he should check and see
> if his problem is not the lab rather than exposure before he
> does anything else.
> --Tom
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