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<blockquote data-quote="Bob Blaylock" data-source="post: 355876" data-attributes="member: 16749">I had this thought in my head, even before you started this thread, to take a sequence of pictures with my old Vivitar 85-205, to show the effect of aperture on image quality and depth of field.&nbsp; I just now got around to doing so, and have posted the results in <a href="http://nikonites.com/education/25527-aperture-depth_of_field-relationship-vivitar-85-205mm-f3-8-tele-zoom.html" target="_blank">this thread</a>.&nbsp; I think viewing that thread may be helpful to you in understanding the principles about which you are asking here.&nbsp; Your lens will surely have different characteristics than mine, but certain principles are rather universal, and can be seen in my thread:<ul>
<li data-xf-list-type="ul">Wider apertures will tend to produce a softer image overall, while smaller apertures will tend to give you a sharper image.</li>
<li data-xf-list-type="ul">Smaller apertures give you greater depth of field, allowing objects to be in focus at distances that vary more from that at which the lens is focused.&nbsp; Wider apertures give you less depth of field.</li>
<li data-xf-list-type="ul">Shorter focal lengths also give greater depth of field, while longer focal lengths give shallower depth of field.</li>
<li data-xf-list-type="ul">Any aberrations in the lens tend to show up more greatly at wider apertures.</li>
</ul></blockquote>

[QUOTE="Bob Blaylock, post: 355876, member: 16749"] I had this thought in my head, even before you started this thread, to take a sequence of pictures with my old Vivitar 85-205, to show the effect of aperture on image quality and depth of field. I just now got around to doing so, and have posted the results in [url=http://nikonites.com/education/25527-aperture-depth_of_field-relationship-vivitar-85-205mm-f3-8-tele-zoom.html]this thread[/url]. I think viewing that thread may be helpful to you in understanding the principles about which you are asking here. Your lens will surely have different characteristics than mine, but certain principles are rather universal, and can be seen in my thread: [list][*]Wider apertures will tend to produce a softer image overall, while smaller apertures will tend to give you a sharper image. [*]Smaller apertures give you greater depth of field, allowing objects to be in focus at distances that vary more from that at which the lens is focused. Wider apertures give you less depth of field. [*]Shorter focal lengths also give greater depth of field, while longer focal lengths give shallower depth of field. [*]Any aberrations in the lens tend to show up more greatly at wider apertures. [/list] [/QUOTE]

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