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<blockquote data-quote="SteveH" data-source="post: 359981" data-attributes="member: 9252"><p>The aperture, is basically a hole in the lens, that opens and closes a bit like the iris in your eye. This controls the amount of light that can pass through the lens to the shutter, but also it controls the <em>Depth of field </em>( which is how much of your picture is in focus, front to back). The aperture is measured in F-Stops, and a wide aperture has a low F number, such as F1.8 and a narrow aperture has a high number - A typical maximum is F22 or F32.</p><p></p><p>When it comes to sharpness, there is a big range between the wide end F1.8, or for the lens you have, F3.5 and narrow at F22 so there is a certain amount of compromise in the lens construction. Therefore, you will typically find that your pictures will get progressively sharper up to around F8 or F11, after which they may start to get soft again. It is all down to the glass in your lens and its quality.</p><p></p><p></p><p>Have a look at this thread, written recently... I wrote the first reply in the thread which is very relevant to your question here.... <a href="http://nikonites.com/d3100/25441-d3100-iso-numbers-f-settings.html#axzz3EFPH4vVn" target="_blank">http://nikonites.com/d3100/25441-d3100-iso-numbers-f-settings.html#axzz3EFPH4vVn</a></p></blockquote><p></p>
[QUOTE="SteveH, post: 359981, member: 9252"] The aperture, is basically a hole in the lens, that opens and closes a bit like the iris in your eye. This controls the amount of light that can pass through the lens to the shutter, but also it controls the [I]Depth of field [/I]( which is how much of your picture is in focus, front to back). The aperture is measured in F-Stops, and a wide aperture has a low F number, such as F1.8 and a narrow aperture has a high number - A typical maximum is F22 or F32. When it comes to sharpness, there is a big range between the wide end F1.8, or for the lens you have, F3.5 and narrow at F22 so there is a certain amount of compromise in the lens construction. Therefore, you will typically find that your pictures will get progressively sharper up to around F8 or F11, after which they may start to get soft again. It is all down to the glass in your lens and its quality. Have a look at this thread, written recently... I wrote the first reply in the thread which is very relevant to your question here.... [URL]http://nikonites.com/d3100/25441-d3100-iso-numbers-f-settings.html#axzz3EFPH4vVn[/URL] [/QUOTE]
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