Archived posting to the Leica Users Group, 2002/05/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have to ask. What for? - -----Original Message----- From: Oliver Bryk [mailto:oliverbryk@attbi.com] Sent: 29 May 2002 16:20 To: Leica-Users Subject: [Leica] Depth of field vs. depth of focus Dante Stella wrote: "Can someone point me to a formula for calculating depth of focus for a given focal length and aperture? This is NOT depth of field, but rather the focus zone on and around the film plane." fCalc and similar calculators derive depth of field, not depth of focus. According to John Williams's "Image Clarity: High Resolution Photography", depth-of-field calculators assume that the image cone is geometrically exact. The depth of focus is in part a function of lens design errors, diffraction, and construction defects. I haven't found any references to methods for calculating it. I'm way out of my field here; Erwin Puts to the rescue! Oliver Bryk - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - ------------------------------------------------------------------------------ This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html