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Forum: General Discussion Apr 6, 2010, 6:45 AM
Replies: 37
Views: 2,913
Posted By TCav
Yes. You're absolutely correct. That's the...

Yes. You're absolutely correct. That's the purpose of HDR: to represent the large dynamic range of a scene within the small dynamic range of the medium. You're compressing the dynamic range of the...
Forum: General Discussion Apr 2, 2010, 12:30 PM
Replies: 37
Views: 2,913
Posted By TCav
Actually, "interstellar" would be "dark", not...

Actually, "interstellar" would be "dark", not "light".

The human eye has a dynamic range of about 90dB (http://en.wikipedia.org/wiki/Dynamic_range#Dynamic_range_and_human_perception), but not all...
Forum: General Discussion Apr 2, 2010, 10:52 AM
Replies: 37
Views: 2,913
Posted By TCav
But, once again, we wouldn't want to have direct...

But, once again, we wouldn't want to have direct sunlight in a photo, and we certainly wouldn't want to visually compose an image that included the sun, without using at least an ND4 filter. So we...
Forum: General Discussion Apr 2, 2010, 9:34 AM
Replies: 37
Views: 2,913
Posted By TCav
Yes, but that presupposes a Persistence of Vision...

Yes, but that presupposes a Persistence of Vision (http://en.wikipedia.org/wiki/Persistence_of_vision) of 1/25 second, which doesn't apply in still photography. If you use a shutter speed of 1/12...
Forum: General Discussion Apr 2, 2010, 7:30 AM
Replies: 37
Views: 2,913
Posted By TCav
If we stick with B&W (for the sake of ...

If we stick with B&W (for the sake of simplicity), then an 8 bit image is limited to 256 descrete grays, within the dynamic range of the image. HDR doesn't change that. It just brightens the darker...
Forum: General Discussion Apr 1, 2010, 8:26 PM
Replies: 37
Views: 2,913
Posted By TCav
The Wikipedia article on HDR...

The Wikipedia article on HDR (http://en.wikipedia.org/wiki/High_dynamic_range_imaging) lists the dynamic range of a Canon EOS-1D Mark II. At ISO 50, it has a dynamic range of 11.3 EV, it peaks at ISO...
Forum: General Discussion Mar 31, 2010, 4:18 PM
Replies: 37
Views: 2,913
Posted By TCav
When you look at something, your iris adjusts the...

When you look at something, your iris adjusts the diameter of the pupil so that you receive enough light so you can see and recognize the detail on whatever it is you're looking at. Other nearby...
Forum: General Discussion Mar 31, 2010, 6:51 AM
Replies: 37
Views: 2,913
Posted By TCav
I would like to think that we all know enough not...

I would like to think that we all know enough not to point our cameras directly into the sun, so I think that even the sun is more brightness than we need to account for in out photography.

There...
Forum: General Discussion Mar 31, 2010, 5:48 AM
Replies: 37
Views: 2,913
Posted By TCav
The earth's atmosphere scatters short-wavelength...

The earth's atmosphere scatters short-wavelength light more than long-wavelength light. When the sun is high in the sky, violet and blue light is scattered over the entire sky, making it blue, and...
Forum: General Discussion Mar 30, 2010, 12:15 PM
Replies: 37
Views: 2,913
Posted By TCav
The Sun isn't 100% white. That's why the sky is...

The Sun isn't 100% white. That's why the sky is blue and sunsets are red. Magnesium Oxide is 100% white (well, 99.996% white, actually), even if it's in a dark room.

Digital cameras are capable...
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