Archived posting to the Leica Users Group, 1999/11/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]This is a multi-part message in MIME format. - ------=_NextPart_000_0087_01BF3B76.E6124540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I just did a quick Yahoo search and came up with the following: = http://members.aol.com/Photoinfo/dof.html. Here's what it states on the subject:=20 >>>> Camera Settings and Their Affect on Depth of Field For a given focal length, the smaller the lens opening (larger aperture = number) the greater the depth of field. Generally, the depth of field will be the same with any focal length = yielding the same image size if the same aperture setting is used. An example lens/distance/aperture combo that yields the same depth of = field:=20 - - 50mm lens at a subject distance of 20 ft at f/8 - - 100mm lens at a subject distance of 40 ft at f/8 Note: When using small apertures (say f/16 or smaller), long lenses do = result in slightly less depth of field than shorter focal lengths = yielding the same image size. <<< So if it is right: "generally yes, but not at long focal lengths and = small f stops".=20 - ------=_NextPart_000_0087_01BF3B76.E6124540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2014.210" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D2>I just did a quick Yahoo search and came up with the = following: <A=20 href=3D"http://members.aol.com/Photoinfo/dof.html">http://members.aol.com= /Photoinfo/dof.html</A>.</FONT></DIV> <DIV> </DIV> <DIV><FONT size=3D2>Here's what it states on the subject: </FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>>>>></DIV> <P align=3Dcenter><FONT color=3D#000040 size=3D5>Camera Settings and = Their Affect on=20 Depth of Field<BR></P> <P align=3Dleft><FONT color=3D#000040 size=3D3><B><BR>For a given focal = length</B>,=20 the smaller the lens opening (larger aperture number) the greater the = depth of=20 field.<BR><BR>Generally, the depth of field will be the same with any = focal=20 length yielding the same image size if the same aperture setting is=20 used.<BR><BR>An example lens/distance/aperture combo that yields the = <B>same=20 depth of field</B>: <BR><BR>- 50mm lens at a subject distance of 20 ft = at=20 f/8<BR>- 100mm lens at a subject distance of 40 ft at f/8<BR><FONT = color=3D#000040=20 size=3D5><BR><FONT color=3D#000040 size=3D3>Note: When using small = apertures (say f/16=20 or smaller), long lenses do result in slightly less depth of field than = shorter=20 focal lengths yielding the same image size.</FONT></FONT></FONT></P> <P align=3Dleft><FONT size=3D3><<<</FONT></P> <P align=3Dleft><FONT size=3D3>So if it is right: "generally yes, but = not at long=20 focal lengths and small f stops". </FONT></P> <P align=3Dleft> </P> <P align=3Dleft><FONT color=3D#000040 size=3D3><FONT color=3D#000040 = size=3D5><FONT=20 color=3D#000040 size=3D3></FONT></FONT></FONT> </P> <P align=3Dleft><FONT color=3D#000040 size=3D3><FONT color=3D#000040 = size=3D5><FONT=20 color=3D#000040=20 size=3D3><BR><BR><BR> </P></FONT></FONT></FONT></FONT></FONT></BODY>= </HTML> - ------=_NextPart_000_0087_01BF3B76.E6124540--