I also agree with JCO. The difference between a 50mm and 100mm is not the DOF, assuming your object has the same size on your film or sensor. The difference is a bigger working distance for the 100mm, and a smaller angle of view, which gives you more change to get a less distracting background.
On Wednesday 11 August 2004 07:52, Jens Bladt wrote: FJW> I'm sure most of us agree to th opposite. Sertainly a 100 mm gives you less FJW> DOF than a 50 mm. That's why smaller formats - lika many digital cameras - FJW> have larger DOF, provided the same angle of view is obtained by a shorter FJW> focal length. FJW> Jens FJW> FJW> Jens Bladt FJW> mailto:[EMAIL PROTECTED] FJW> http://hjem.get2net.dk/bladt FJW> FJW> FJW> -----Oprindelig meddelelse----- FJW> Fra: J. C. O'Connell [mailto:[EMAIL PROTECTED] FJW> Sendt: 10. august 2004 02:49 FJW> Til: [EMAIL PROTECTED] FJW> Emne: RE: 50 or 100 mm FJW> FJW> FJW> W R O N G ! ! the 100mm will have exact same DOF as the 50mm at the FJW> same magnification and aperture. FJW> focal length has no effect on DOF, it is determined solely by FJW> magnification and aperture. FJW> JCO FJW> FJW> -----Original Message----- FJW> From: Herb Chong [mailto:[EMAIL PROTECTED] FJW> Sent: Monday, August 09, 2004 8:41 PM FJW> To: [EMAIL PROTECTED] FJW> Subject: Re: 50 or 100 mm FJW> FJW> FJW> the 100mm has a shallower DOF and a greater working distance for a given FJW> magnification. as for terminology, it's convention and there is no rule. FJW> i've always seen microphotography as taken with a microscope as the lens FJW> system. FJW> FJW> Herb... FJW> ----- Original Message ----- FJW> From: "Anders Hultman" <[EMAIL PROTECTED]> FJW> To: <[EMAIL PROTECTED]> FJW> Sent: Monday, August 09, 2004 4:26 PM FJW> Subject: 50 or 100 mm FJW> FJW> FJW> > Exciting with the new lenses. Could someone please explain what the FJW> > difference in focal length will mean for macro shots? I fully FJW> > understand what difference it makes in regular shooting conditions, FJW> > but wouldn't "life size" 1:1 magnification become 1:1 regardless? What FJW> FJW> > difference does it make then? FJW> > FJW> > And another thing about macro; when objects become larger than life FJW> > size, someone said that it is called micro rather than macro. Is that FJW> > true? FJW> FJW> FJW> FJW> FJW> FJW> -- Frits W�thrich
