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Wow - Today's Wikipedia POTD

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Originally posted by: mwtgg
Originally posted by: notfred
Where is it? It looks like Northern California.

Beautiful landscapes do exist outside of California.

Obviously yes. However, I would have made the same guess because the first time I have ever seen those freakishly treeless brown hills was when I came over to California to visit my brother.
 
Originally posted by: tfinch2
Originally posted by: binister
Originally posted by: Quasmo
damn nice DoF

I agree...

I have always been confused about DoF... Some sites on the internet claim it is affected by distance to subject, aperature and focal length. While others claim that focal length has no effect, like this one that actually demonstrates it.

Anyone know which is correct?

Sensor size, distance to subject, aperture all effect DOF.

Sensor size shouldn't really affect DOF. It affects the lens factor. For example, 1.6x on the Canon 300D. It's essentially cropping. Optically, it's not a true magnification. The lenses aren't stopping down or anything to direct all the incoming light onto a smaller surface...unless we're talking about ef-s lenses, and then I don't really know if that's an issue or not.

But focal length, distance to subject and aperture do all affect DOF.

edit: Well, actually, I don't know if focal length actually affects DOF. But it does affect perspective, which can certainly seem to affect DOF.
 
Originally posted by: binister
Originally posted by: OdiN
Originally posted by: binister
Originally posted by: Quasmo
damn nice DoF

I agree...

I have always been confused about DoF... Some sites on the internet claim it is affected by distance to subject, aperature and focal length. While others claim that focal length has no effect, like this one that actually demonstrates it.

Anyone know which is correct?

Focal length doesn't actually affect it, though it can have a percieved affect on it.

So if my aperture and distance to subject are fixed, and I take one picture with a 50mm lens and another with a 300mm lens (same subject) the objects that appear in both pictures will be equally in focus?

Yes, but your perspective will be different. Things in the foreground/background will appear closer/squashed to your subject with the longer lens. While the DOF remains the same, it's as if the "range" of the field is reduced. Hence the differences in perspective in that link.
 
Originally posted by: Gooberlx2
Originally posted by: tfinch2
Originally posted by: binister
Originally posted by: Quasmo
damn nice DoF

I agree...

I have always been confused about DoF... Some sites on the internet claim it is affected by distance to subject, aperature and focal length. While others claim that focal length has no effect, like this one that actually demonstrates it.

Anyone know which is correct?

Sensor size, distance to subject, aperture all effect DOF.

Sensor size shouldn't really affect DOF. It affects the lens factor. For example, 1.6x on the Canon 300D. It's essentially cropping. Optically, it's not a true magnification. The lenses aren't stopping down or anything to direct all the incoming light onto a smaller surface...unless we're talking about ef-s lenses, and then I don't really know if that's an issue or not.

But focal length, distance to subject and aperture do all affect DOF.

edit: Well, actually, I don't know if focal length actually affects DOF. But it does affect perspective, which can certainly seem to affect DOF.

Sensor size does affect DOF. I mean look at P&S. Why can't they achieve the bokeh effect (besides with macro and extreme telephoto)? Because the sensor is so small. Sure f/2 is f/2 is f/2 when it comes to lighting and exposure, but for example f/2 on an Olympus 4/3's sensor is going to provide the same DOF as f/4 on a Canon 5D FF sensor because the sensor is half the size.
 
Thanks, going on the backround on the machine at home...... Whenever the hell i get there, cant today end already?
 
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