Tutorial: Aperture (repost)

[JakeB.]

Aperture Aperture is how wide a lens opens, effecting how much light is let into the camera when the shutter is released. When a poor lighting situation is unavoidable, a large aperture is necesarry to keep the shutter speed high enough to avoid motion blur. The aperture a lens is using or capable of is referred to with f/x... the smaller a number, the larger the aperture. These are shots of my 50mm f/1.8 1. f/1.8 - You can see that the lens is completely open 2. f/4 3. f/8 4. f/16 5. f/22

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[hapexamendios 2.0]

very helpful info, thanks

[AP Kreuzer]

nice my d40 shows this on the lcd screen which is a plus

[matt_shaban]

nice, Jake.

[MSchu]

That original description while correct is far from complete... the effects of wide open versus closed down are vast, but the biggest issue is the effect on depth of field.


Wide open settings yields depths for fields that are extremely short:



Closed down Settings yield near infinity depths:

[JakeB.]

Originally Posted by MSchu

That original description while correct is far from complete...

http://honda-tech.com/zerothread/2010790

[MSchu]

Like you said... 101

[XxDJCyberLoverxX]

Hi, I'd hate to bring this thread back from the dead, but I've been reading the FAQs, links and threads about photography, since my backpacking trip abroad has gotten me seriously interested in photography. And sorry for a N00b question:

Can someone tell me the relationship between aperture and ISO? It seems like the smaller the aperture, the less light it enables the lens to pass through. Would that mean that a higher ISO is needed to capture more light since less light is passing through the lens?

When would it be more appropriate to use a small aperture? I see the relationship between aperture and depth of field, but is that what aperture is used for?

Thank you!

[JakeB.]

Originally Posted by XxDJCyberLoverxX

Can someone tell me the relationship between aperture and ISO? It seems like the smaller the aperture, the less light it enables the lens to pass through. Would that mean that a higher ISO is needed to capture more light since less light is passing through the lens?

You're correct in your thoughts here... the smaller aperture allows lees light through the lens.

But, you don't necesarrily have change the ISO. The exposure is a result of the aperture, shutter speed, iso, and light.
You can change them all to effect the exposure, but only have to change one.

Originally Posted by XxDJCyberLoverxX

When would it be more appropriate to use a small aperture? I see the relationship between aperture and depth of field, but is that what aperture is used for?

Thank you!

I'm not an expert, but I would say that the primary use for aperture is to determine depth of field.
You select the aperture for the DOF you'd like and then adjust one of the other settings necessary for getting the proper exposure.

[XxDJCyberLoverxX]

Thanks a lot JakeB.! That was really informative.

[96whiteknight]

Originally Posted by XxDJCyberLoverxX

When would it be more appropriate to use a small aperture?

It's fairly common to use a very small aperture when shooting landscapes.