Archived posting to the Leica Users Group, 2002/05/31
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]No I know why you wanted a depth of focus calculator. A brilliant article. Thanks Dante. - -----Original Message----- From: dante@umich.edu [mailto:dante@umich.edu] Sent: 31 May 2002 13:57 To: hexarRF@yahoogroups.com; Leica Users; RF List; CosVoigtUser@topica.com Subject: [Leica] <no subject> If you suffer from the idea that your lenses are misfocusing due to a body focus problem (for example Noctilux, and Summilux 75), you might check out http://www.dantestella.com/technical/flange.html When you do the math, you will discover that it is almost an impossibility that given the manufacturing specs of any M body, that the problem would be the body focus of the body (whether Cosina, Leica or Konica, even given their differing factory specs). Part 1 http://www.dantestella.com/technical/flange.html#dof addresses general issues of depth of focus and depth of field Part 2 http://www.dantestella.com/technical/flange.html#hexar and Part 3 http://www.dantestella.com/technical/flange.html#keppler addresses the interaction between the Hexar RF body focus spec and potential errors you can make in testing Hexar compatibility with Leica, Cosina and other lenses. Part 4 http://www.dantestella.com/technical/flange.html#summilux addresses the fallacy of the Summilux (it's the body's fault/lens's fault, etc) and the unnecessary work Leica and other rangefinder users have done on their cameras (body focus adjustments), when they should be concentrating on rangefinder alignment and more importantly, human factors. Regards - ------------ Dante Stella http://www.dantestella.com - -- 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