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I want to share something I learned in Camera Class last night
Aperture priority, or setting A (or AV). I learned that a higher number is a lower aperture, or lets less light into the lens. The higher the number the better depth of field, which means a clear in focus background. A small aperture like 22-25, or less light means that the shutter has to slow down some and a tripod might be necessary to keep it from being blurry. Having a low number like 3.5, or a high aperture allows light to flood the lens and speed up the shutter speed. It will allow you to capture an image quickly or stop falling water or motion in it's tracks, but at the expense of losing focus on the background(or blurs it)..

This is one of the most confusing things to me before this class. I always wanted to know why sometimes that background is crystal clear, and sometimes the background is a blur...

Comments (11)

Thurnau wrote:.

Having a low number like 3.5,or a high aperture allows light to flood the lens and speed up the.

A few fine points in terms of your wording that you might find helpful:.

The correct terminology for referring to aperature in this case would be a wide aperature not high aperature..

The number you're referring to is the denominator of a fraction - f/3.5, f/22 (F= focal length) Therefore the f stop number of 3.5 is actually a greater number than f22 (1/3 > 1/22)..

Have fun in your camera class!..

Comment #1

Try to improvr in depth of field subject. the bigger the apparture di smaller the DOF is...

Comment #2

You might enjoy playing with the little graphic on this site to get a feel for Depth of Field at different settings..

Http://www.dryreading.com/camera/index.html..

Comment #3

That's not terminolgy Alex, that's terminology. Lol. (Sorry but I couldn't resist it).Jules.

Alex Leach wrote:.

Well, the correct terminolgy is 'aperture'..

Alex.

Http://alexandjustine.smugmug.com/.

Why can't you blow bubbles with chewing gum?..

Comment #4

Interesting Midas, but why at F16 is the foreground blurred (we are told because of the slow shutter speed) but not the background which is still pin sharp. Great idea but sadly faulted website..

Talking of the expression 'pin sharp', think about it! Must have been thought up by a photographer mustn't it?Jules.

Midas wrote:.

You might enjoy playing with the little graphic on this site to get afeel for Depth of Field at different settings..

Http://www.dryreading.com/camera/index.html.

Why can't you blow bubbles with chewing gum?..

Comment #5

Alex Leach wrote:.

Well, the correct terminolgy is 'aperture'..

Alex.

Http://alexandjustine.smugmug.com/.

<:-l..

Comment #6

JulesJ wrote:.

Interesting Midas, but why at F16 is the foreground blurred (we aretold because of the slow shutter speed) but not the background whichis still pin sharp. Great idea but sadly faulted website..

Because of the minimum focus distance...

Comment #7

It has really impressed me and helped me to learn! The ability to change aperture and f-stops and all is just excellent!.

Http://www.dryreading.com/camera/index.html.

LucyE- 510, 14-150 and 14-54 lens!U ZI owner!Olympus C30-20Zhttp://www.pbase.com/lucyFCAS Member #98, Oly Division'Photography is the art of seeing what others do not.'..

Comment #8

And here is an updated link:.

Http://www.dryreading.com/camera/index.html.

You can change:Illumination levelISOF-stopsAperture priorityManual priorityAutoProgramAnd Exposure CompensationLucyE- 510, 14-150 and 14-54 lens!U ZI owner!Olympus C30-20Zhttp://www.pbase.com/lucyFCAS Member #98, Oly Division'Photography is the art of seeing what others do not.'..

Comment #9

Ummmn no. The background should be blurred still to some extent.Jules.

Neo_nights wrote:.

JulesJ wrote:.

Interesting Midas, but why at F16 is the foreground blurred (we aretold because of the slow shutter speed) but not the background whichis still pin sharp. Great idea but sadly faulted website..

Because of the minimum focus distance..

Why can't you blow bubbles with chewing gum?..

Comment #10

Hi Thurnau. It seems you understand the basics enough to be able to put it into practice, but I'll just clarify some of the terminology, trying not to get too carried away..

Thurnau wrote:.

Aperture priority, or setting A (or AV)..

Also aperture value. On your camera, it means the f-stop number, which is a ratio of lens focal length to aperture diameter, eg f/4. In this example, it means the focal length of the lens is 4 times as big as the diameter of the aperture opening..

I learned that a highernumber.

Higher f/stop number (arguably a lower number, because it's a ratio, but people normally say higher based on the denominator of the ratio).

Is a lower aperture,.

Smaller aperture.

Or lets less light into the lens. Thehigher the number.

Higher the f-stop number.

The better depth of field,.

The greater/larger the DOF, not necessarily better, as you might want a smaller DOF for a particular image, and that would be better.

Which means a clear infocus background..

Means greater range of focus both in front of and behind the focus point..

A small aperture like 22-25, or less light means.

Large f-stop like f/22 means a small aperture.

That the shutter has to slow down some and a tripod might benecessary to keep it from being blurry..

You can also increase ISO to at least partially offset the need for a longer exposure..

Having a low number like 3.5,.

Small f-stop like f/3.5.

Or a high aperture.

Means a wide aperture.

Allows light to flood the lens and speed up theshutter speed. It will allow you to capture an image quickly or stopfalling water or motion in it's tracks, but at the expense of losingfocus on the background(or blurs it)..

Reduces depth of field (reduces the distance that's in focus both in front of and behind the focus point)..

Points about larger and smaller f-stop numbers meaning larger and smaller DOF assume the subject distance and lens focal length remain the same. Subject distance affects DOF. Differing lens focal length or f-stop number will change the actual aperture size, which is what really affects DOF. Large aperture opening = small DOF (regardless of lens FL and f-stop) and small aperture opening = large DOF (regardless of lens FL and f-stop)..

This is one of the most confusing things to me before this class. Ialways wanted to know why sometimes that background is crystal clear,and sometimes the background is a blur..

Now you know! :^).

Cheers from John from Adelaide, South AustraliaJohn Harvey Photography http://johnharvey.com.auCanon 40D, Canon 20D & Fuji F10..

Comment #11

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