# Sunny 16 rule

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• 03-02-2014, 03:18 PM
jnanian
Quote:

Originally Posted by Chan Tran
I think the OP's posted the questions rather poorly but really the question has nothing to do with determining correct exposure. It only asks the difference in stops for 2 camera settings.

In the first post is really asking between f/16@1/100@ISO100 and f/2.8@1/50@ISO800 how many stops difference are there?
In the second post is really asking between f/16@1/100@ISO100 and f/2.8@1/50@ISO640 how many stops different?

That's all has nothing to do with getting proper exposure and that is why I think it's an academic question and not something the OP wanted to know.

the way it was worded was difficult to understand
but the end answer isn't very difficult to figure out ... i think ?
• 03-02-2014, 03:38 PM
markbarendt
Quote:

Originally Posted by jnanian
the way it was worded was difficult to understand
but the end answer isn't very difficult to figure out ... i think ?

What we understand is that the difference between f2.8 and f16 is 5, not 13.2. The first question is asking us to write the equation that gets us 5 when we look for the difference between 16 and 2.8; and show that 4 is the difference between 1/50 & 1/800.
• 03-02-2014, 03:47 PM
Steve Smith
Quote:

Originally Posted by benjiboy
+1, The human eyes and the brain are very poor instruments to evaluate light because they react too quickly and imperceptibly to changes of light intensity for us to notice them.

I agree that the human eye cannot detect actual light levels due to the 'automatic exposure' mechanism in the eye. However, we can judge contrast very well by the distinctiveness of shadows.

As the sun is a constant, the only variable during daylight hours is the amount of diffusion given by the clouds and this can be judged very well by eye.

Steve.
• 03-02-2014, 04:07 PM
Mark Crabtree
Quote:

Originally Posted by Steve Smith
I agree that the human eye cannot detect actual light levels due to the 'automatic exposure' mechanism in the eye. However, we can judge contrast very well by the distinctiveness of shadows.

As the sun is a constant, the only variable during daylight hours is the amount of diffusion given by the clouds and this can be judged very well by eye.

Steve.

And the amount of the subject in shade, which is what seems to me is often left out by the Sunny 16 rule. Sure the main subject may be in full sun, but it is generally agreed (I'm sure not by every single person though) that you expose negative film for the amount of shadow detail you need. To me, Sunny 16 is more a useful snapshot rule where the nuiances of shadow detail may not matter, or for transparnency film. 1/500 @ f11 is about the least exposure I ever use for Tri-x (ISO 400) in full sun, though I can picture situations where f16 would be adequate. So my rule of thumb is Sunny 11. Doesn't have the same ring to it, but it gives me exposures I like better. I actually am often likely to give more than that in many cases. And more diffusion often doesn't change that exposure for me since it often doesn't change the shadow level.

As has been pointed out, the differences between the old and new shutter speeds are small and ignorable. Thinking in half stops for aperture is perfectly adequate. For me, when in between, give move the dial in the direction of exposure rather than less, at least if using Sunny 16.

To be clear, I'm not disagreeing with anyone, just expressing my feeling about the adequacy of the Sunny 16 rule, and how that impacts the OP's question.
• 03-02-2014, 04:16 PM
Chan Tran
Quote:

Originally Posted by jnanian
the way it was worded was difficult to understand
but the end answer isn't very difficult to figure out ... i think ?

No the answer is easy but I am wondering which method would a teacher teach students to do this? So many ways to figure out the answer which way it was taught?
• 03-02-2014, 04:56 PM
Prof_Pixel
It's really very simple.

Indoors with ISO 800 film: 1/50 sec at f/2.8

Outdoors with sunny 16 rule and ISO 800 film: 1/800 sec at f/16

1/50 sec to 1/800 sec is 4 stops (1/100, 1/200, 1/400, 1/800)

f/2.8 to f/16 is 5 stops (4, 5.6, 8, 11,16)

4 = 5 = 9 stops darker
• 03-02-2014, 05:49 PM
RalphLambrecht
It's esy. All you have t to do is multiply the indoor exposurewith the temperature difference to get he outdoor exposure;in F for asa and in Cfor iso.
• 03-02-2014, 05:57 PM
markbarendt
Quote:

Originally Posted by RalphLambrecht
It's esy. all you have tto do is multiply the indoor exposurewith the temperature difference to get he outdoor exposure;in F for asa and in Cfor iso.

Thanks Ralph I new there was a way.
• 03-02-2014, 07:26 PM
benjiboy
It stands to reason if "sunny 16" was so accurate and produced such perfect exposures nobody would ever have ever invented light meters.
• 03-02-2014, 07:35 PM
Mark Crabtree
Quote:

Originally Posted by benjiboy
It stands to reason if "sunny 16" was so accurate and produced such perfect exposures nobody would ever have ever invented light meters.

It does? People don't take pictures other than in the sun?
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