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Black_Jacobin

Black_Jacobin

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Clydeen Mc Donald
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Could some one tell me the standard exposure for window light and bright sunlight i am using ISO 100
 
There's the sunny 16 rule for outside in sunlight - f/16 and shutter same as ISO but it's a guideline really.

Window light is just too variable, the size of the window, the colour/distance of the walls, the subject's distance from the window and so on will all have a big effect on the amount of light so you can't really have a "standard" setting for it.
 
Sunny f/16 is also based on the brightness of "sunny" we get in the UK, it is probably a bit brighter in Trinidad and Tobago. The sunny f/16 rule is as good a place as any to start experimenting. If it turns out to cause overexposure, I would increase the shutter speed since narrowing the aperture will probably cause diffraction softness at the smaller apertures.
 
I've never heard of sunny 16 being a british thing before - I didn't realise that we were that much further away from the sun than other countries ;)
 
Interesting so what shutter u advise then because i have used 1/125 with f4 at iso 100 and had good results
 
There isn't a right or wrong answer. The settings you use depend entirely on how much light there is and that can't be lumped into different scenarios such as outside sunshine, indoors window light, etc. The amount of light you have varies all the time so you really need to take a reading using the camera's meter or a seperate light meter and use the right settings based on the measurement.

I'm guessing that you're new to photography in which case I would suggest a search and browse through the forums for subjects dealing with exposure. There is a wealth of good advice and knowledge that should set on you the right path :thumbs:
 
This link is worth a look, although possibly not for the beginner.

Best bet (for the digital user at least) is experiment. Different cameras behave differently and different meters will give different results. Negative film will have a greater lattitude than slide, although once you scan and print the slide, you can do a certain amount of correction if needed.


http://www.fredparker.com/ultexp1.htm
 
pxl8 said:
I've never heard of sunny 16 being a british thing before - I didn't realise that we were that much further away from the sun than other countries ;)
Click to expand...


:lol:

...theres at least a few hundred miles difference surely ... :D

... although it does change a tad every 22 thousand years so its difficult to say I suppose.
 
pxl8 said:
I've never heard of sunny 16 being a british thing before - I didn't realise that we were that much further away from the sun than other countries ;)
Click to expand...

Isn't that why it is hotter closer to the equator/ tropics of cancer/capricorn?

They get longer days as well. Hence why scotland is (generally) colder than devon.

can't tell you if it affects the shutter speed.
 
Its not that i am new but someone asked the question today and i could not tell them what they wanted to here because to me it depends on what i see
 
lawrie29 said:
Isn't that why it is hotter closer to the equator/ tropics of cancer/capricorn?

They get longer days as well. Hence why scotland is (generally) colder than devon.

can't tell you if it affects the shutter speed.
Click to expand...

Our distance from the sun makes the difference between say the UK and somewhere hot and sunny insignificant. Using rough figures, the sun is 90m miles away and being generous lets say the UK is 500 miles further away than the equator then, ignoring the inverse square law, the UK gets light that is only 99.999995% as bright, probably less than the human eye can register and certainly way beyond anything a camera could record. On the other hand something like pollution would have a far more noticable (but still tiny) effect.
 
lawrie29 said:
Isn't that why it is hotter closer to the equator/ tropics of cancer/capricorn?

They get longer days as well. Hence why scotland is (generally) colder than devon.

can't tell you if it affects the shutter speed.
Click to expand...

Simple answer: no

The difference in distant isn't insignificant as pxl8 suggests, but because the extra distance is a vacuum there is no energy loss

Its to do with the angle of the Earth's surface to the sun. A perpendicular surface (equator) will have 1 unit of energy per unit area. Surface parallel, or near parallel, will have a larger surface area for the same amount of energy to be spread over.

Here's a rough doodle to try and show it diagramatically. The red line is the same thickness and represents the same amount of energy (heat or light)

3042720403_f435922928_o.jpg
 
:thinking:

yeah, what he said
 
Uneducated_Rick said:
Simple answer: no

The difference in distant isn't insignificant as pxl8 suggests, but because the extra distance is a vacuum there is no energy loss

Its to do with the angle of the Earth's surface to the sun. A perpendicular surface (equator) will have 1 unit of energy per unit area. Surface parallel, or near parallel, will have a larger surface area for the same amount of energy to be spread over.

Here's a rough doodle to try and show it diagramatically. The red line is the same thickness and represents the same amount of energy (heat or light)

3042720403_f435922928_o.jpg
Click to expand...

The distance does matter because the inv sq law still applies through the vacuum of space so in that respect the small difference in distance between the UK and somewhere near the equator is insigificant. Your example doesn't take into account scattering by particles in the atmosphere which play a huge part in how Earth is "lit" by the sun, it's like having a giant diffuser in the way, nor does it account for light bouncing between the surface and atmosphere.
shaded.jpg

Using your model the earth would be shaded like the top sphere (lambert diffuse) in the image below, when in fact it's much closer to the second (my own version of the Oren-Nayer model).

Here's a shot from NASA that shows how evenly lit the earth looks.
http://dayton.hq.nasa.gov/IMAGES/SMALL/GPN-2000-001138.jpg

In terms of brightness the UK is probably a fraction of a percent of a stop darker than the equator which, in terms of exposure, is insigificant considering we normal makes changes of at least 33%. So going back to the original point - Sunny 16 isn't just for the UK ;)
 
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