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Wildlife and Depth of Field
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<blockquote data-quote="Revet" data-source="post: 331506" data-attributes="member: 17612"><p>Here is from Depth of Field in Wikipedia:</p><p></p><p>[h=2]Factors affecting depth of field<span style="font-family: 'sans-serif'"><span style="color: #555555">[</span><a href="http://en.wikipedia.org/w/index.php?title=Depth_of_field&action=edit&section=3" target="_blank">edit</a><span style="color: #555555">]</span></span>[/h]<span style="color: #252525"><span style="font-family: 'sans-serif'"><p style="text-align: center"><a href="http://en.wikipedia.org/wiki/File:Lens_aperture_side.jpg" target="_blank"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Lens_aperture_side.jpg/220px-Lens_aperture_side.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><p style="text-align: left"><a href="http://en.wikipedia.org/wiki/File:Lens_aperture_side.jpg" target="_blank"><img src="http://bits.wikimedia.org/static-1.24wmf12/skins/common/images/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></span></span></p><p style="text-align: left"><span style="color: #252525"><span style="font-family: 'sans-serif'">A 35 mm lens set to <a href="http://en.wikipedia.org/wiki/F-number" target="_blank"><em>f</em>/11</a>. The depth-of-field scale (top) indicates that a subject which is anywhere between 1 and 2 meters in front of the camera will be rendered acceptably sharp. If the aperture were set to <span style="font-family: 'Trebuchet MS'"><em>f</em></span>/22 instead, everything from just over 0.7 meters almost to infinity would appear to be in focus.</p> </p><p></span></span></p><p><span style="color: #252525"><span style="font-family: 'sans-serif'"><p style="text-align: center"><a href="http://en.wikipedia.org/wiki/File:Shallow_Depth_of_Field_with_Bokeh.jpg" target="_blank"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Shallow_Depth_of_Field_with_Bokeh.jpg/220px-Shallow_Depth_of_Field_with_Bokeh.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><p style="text-align: left"><a href="http://en.wikipedia.org/wiki/File:Shallow_Depth_of_Field_with_Bokeh.jpg" target="_blank"><img src="http://bits.wikimedia.org/static-1.24wmf12/skins/common/images/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></span></span></p><p style="text-align: left"><span style="color: #252525"><span style="font-family: 'sans-serif'">Out-of-focus highlights have the shape of the lens aperture.</p> </p><p></span></span></p><p><span style="color: #252525"><span style="font-family: 'sans-serif'">Several other factors, such as subject matter, movement, camera-to-subject distance, lens <a href="http://en.wikipedia.org/wiki/Focal_length" target="_blank">focal length</a>, selected lens <a href="http://en.wikipedia.org/wiki/F-number" target="_blank"><em>f</em>-number</a>, <a href="http://en.wikipedia.org/wiki/Image_sensor_format" target="_blank">format size</a>, and <a href="http://en.wikipedia.org/wiki/Circle_of_confusion" target="_blank">circle of confusion</a> criteria also influence when a given defocus becomes noticeable. The combination of focal length, subject distance, and format size defines magnification at the film / sensor plane.</span></span></p><p><span style="color: #252525"><span style="font-family: 'sans-serif'">DOF is determined by subject <a href="http://en.wikipedia.org/wiki/Magnification" target="_blank">magnification</a> at the film / sensor plane and the selected lens aperture or <em>f</em>-number. For a given <em>f</em>-number, increasing the magnification, either by moving closer to the subject or using a lens of greater focal length, decreases the DOF; decreasing magnification increases DOF. For a given subject magnification, increasing the <em>f</em>-number (decreasing the aperture diameter) increases the DOF; decreasing <em>f</em>-number decreases DOF.</span></span></p><p><span style="color: #252525"><span style="font-family: 'sans-serif'"></span></span></p><p><span style="color: #252525"><span style="font-family: 'sans-serif'">I think it clearly states that DOF is affected by two things; 1) f-stop, and 2) Magnification (which is affected by sensor size, lens focal length, and distance to subject). Thus to the photographer who wants to blur a background, if you zoom in on a subject or get closer (without changing f stop in either case) you will decrease your depth of field (and blurring your background) because of magnification. </span></span></p></blockquote><p></p>
[QUOTE="Revet, post: 331506, member: 17612"] Here is from Depth of Field in Wikipedia: [h=2]Factors affecting depth of field[FONT=sans-serif][COLOR=#555555][[/COLOR][URL="http://en.wikipedia.org/w/index.php?title=Depth_of_field&action=edit§ion=3"]edit[/URL][COLOR=#555555]][/COLOR][/FONT][/h][COLOR=#252525][FONT=sans-serif][CENTER][URL="http://en.wikipedia.org/wiki/File:Lens_aperture_side.jpg"][IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Lens_aperture_side.jpg/220px-Lens_aperture_side.jpg[/IMG][/URL][LEFT][URL="http://en.wikipedia.org/wiki/File:Lens_aperture_side.jpg"][IMG]http://bits.wikimedia.org/static-1.24wmf12/skins/common/images/magnify-clip.png[/IMG][/URL] A 35 mm lens set to [URL="http://en.wikipedia.org/wiki/F-number"][I]f[/I]/11[/URL]. The depth-of-field scale (top) indicates that a subject which is anywhere between 1 and 2 meters in front of the camera will be rendered acceptably sharp. If the aperture were set to [FONT=Trebuchet MS][I]f[/I][/FONT]/22 instead, everything from just over 0.7 meters almost to infinity would appear to be in focus.[/LEFT] [/CENTER] [/FONT][/COLOR] [COLOR=#252525][FONT=sans-serif][CENTER][URL="http://en.wikipedia.org/wiki/File:Shallow_Depth_of_Field_with_Bokeh.jpg"][IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Shallow_Depth_of_Field_with_Bokeh.jpg/220px-Shallow_Depth_of_Field_with_Bokeh.jpg[/IMG][/URL][LEFT][URL="http://en.wikipedia.org/wiki/File:Shallow_Depth_of_Field_with_Bokeh.jpg"][IMG]http://bits.wikimedia.org/static-1.24wmf12/skins/common/images/magnify-clip.png[/IMG][/URL] Out-of-focus highlights have the shape of the lens aperture.[/LEFT] [/CENTER] [/FONT][/COLOR] [COLOR=#252525][FONT=sans-serif]Several other factors, such as subject matter, movement, camera-to-subject distance, lens [URL="http://en.wikipedia.org/wiki/Focal_length"]focal length[/URL], selected lens [URL="http://en.wikipedia.org/wiki/F-number"][I]f[/I]-number[/URL], [URL="http://en.wikipedia.org/wiki/Image_sensor_format"]format size[/URL], and [URL="http://en.wikipedia.org/wiki/Circle_of_confusion"]circle of confusion[/URL] criteria also influence when a given defocus becomes noticeable. The combination of focal length, subject distance, and format size defines magnification at the film / sensor plane.[/FONT][/COLOR] [COLOR=#252525][FONT=sans-serif]DOF is determined by subject [URL="http://en.wikipedia.org/wiki/Magnification"]magnification[/URL] at the film / sensor plane and the selected lens aperture or [I]f[/I]-number. For a given [I]f[/I]-number, increasing the magnification, either by moving closer to the subject or using a lens of greater focal length, decreases the DOF; decreasing magnification increases DOF. For a given subject magnification, increasing the [I]f[/I]-number (decreasing the aperture diameter) increases the DOF; decreasing [I]f[/I]-number decreases DOF. I think it clearly states that DOF is affected by two things; 1) f-stop, and 2) Magnification (which is affected by sensor size, lens focal length, and distance to subject). Thus to the photographer who wants to blur a background, if you zoom in on a subject or get closer (without changing f stop in either case) you will decrease your depth of field (and blurring your background) because of magnification. [/FONT][/COLOR] [/QUOTE]
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