Yeah, but presumably they also use the film format? I know fcalc prompts asking what format you want the COC for. Changing this from 35mm to APS (roughly what a DSLR does) reduced the DOF as a larger magnification would be required to compensate at the enlarging stage. Increasing your distance to subject presumably cancels this out so I would expect you to end up with the same DOF for the same framing within the format used.
> -----Original Message----- > From: Antti-Pekka Virjonen [mailto:[EMAIL PROTECTED]] > Sent: 28 November 2002 12:55 > To: [EMAIL PROTECTED] > Subject: Re: DOF in DSLRs - HELP ME PLEASE... > > > At 06:43 28.11.2002 -0600, you wrote: > >Depth of field is a factor of reproduction ratio and aperture. Focal > >length doesn't enter into the equation. > > > >William Robb > > Hmm.. the equations (hyperfocal distance, near and far focus > limits) I have seen or used all include the focal length of the lens. > > A very simple "DOF explained" can be found at Pentax > University: > http://www.pentax.com/university/photo101/index.cfm?photoconte nt=univ%5Fphoto%5F06%2Ecfm Antti-Pekka --- * Antti-Pekka Virjonen * Fiskarsinkatu 7 D * GSM: +358 500 789 753 * * Computec Oy Turku * FIN-20750 Turku Finland * Fax: +358 10 264 0777 *
