Well, if you use f stops that are prime numbers you can disregard all the optical math. Or so I've been told.
Rob On Nov 10, 2009, at 10:49 AM, CarlosMFreaza wrote:
Yes Austin, I know that the calculator is correct, what's the point? Carlos 2009/11/10, Austin Franklin <austin.franklin@xxxxxxxxxxx>:Hi Carlos, The calculator is correct. You're either missing the point, or an understanding of the point. I must admit, I'm a bit surprised. Regards, Austin-----Original Message----- From: rollei_list-bounce@xxxxxxxxxxxxx [mailto:rollei_list-bounce@xxxxxxxxxxxxx]On Behalf Of CarlosMFreaza Sent: Tuesday, November 10, 2009 10:36 AM To: rollei_list@xxxxxxxxxxxxx Subject: [rollei_list] Re: Rolleiflex 35mm Cameras Eric, I showed you a real DOF calculator for the real photographic world that I have used a lot of times with constant results forphotographs that I can also show, this the practice of photography, behappy with your theories. Carlos 2009/11/10, Eric Goldstein <egoldste@xxxxxxxxx>:Read and learn, Carlos: http://www.normankoren.com/Tutorials/MTF6.html#DOF_focal_length http://www.luminous-landscape.com/tutorials/dof2.shtml Eric Goldstein -- On Tue, Nov 10, 2009 at 9:59 AM, CarlosMFreaza<cmfreaza@xxxxxxxxx> wrote:I'm afraid you are wrong Eric, DOF is purely a function of aperture for a given lens (and given frame size), but if the lens focal length changes the DOF also changes if keeping constant f stop and circle of confusion size . You could play with this DOF calculator changing only the lens focal length and you'll see the way the real DOF area alsochanges: http://www.dofmaster.com/dofjs.html Carlos 2009/11/10, Eric Goldstein <egoldste@xxxxxxxxx>:It can be argued that DOF is purely a function of apertureand not FL.Eric Goldstein -- On Tue, Nov 10, 2009 at 9:32 AM, CarlosMFreaza<cmfreaza@xxxxxxxxx> wrote:Well, "any" camera is a term general too much. DOF has to do firstwith the lens focal length and the frame size and the circle of confusion size you consider acceptable and second with thef stop; youcould stop down a 300mm lens for a 6x9 format at f11 or 16 (to saysomething) and you could still have more deeper DOF withthe Rollei 35at f3.5, my point was that the Rollei 35 Tessar has areasonable DOFand sharpness even wide open if you focus close to your desired focusing point, in other words, it is not necessary atelemeter underthese conditions, perhaps this was not the topic centralaxis but ithas to do with some messages I read in the thread. BTW, the "universal" camera does not exist yet, if you know your tools, you also know where and why to use them.- Carlos 2009/11/10, Marvin <marvin0@xxxxxxxxxxxxxx>:I think you missed the point Carlos, it's possible tostop the lens down andhave a large depth of field with just about any camera,but that doesn'tafford the individual much control. That's the problemwith the 35.Marvin. -----Original Message----- From: rollei_list-bounce@xxxxxxxxxxxxx [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf OfCarlosMFreazaSent: 10 November 2009 17:01 To: rollei_list@xxxxxxxxxxxxx Subject: [rollei_list] Re: Rolleiflex 35mm Cameras I rarely had problems guessing the distance with theRollei 35, thesetwo samples were taken during a travel, with the Tessarwide open, 3,51/30 shutter speed and camera hand-held, the film was aKodak Ultra400. The DOF is still deep at f 3.5 and the camera lightmeter workedright. http://www.flickr.com/photos/itarfoto/1433112977/ http://www.flickr.com/photos/itarfoto/1456649900/ Carlos --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging intowww.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging intowww.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging intowww.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging intowww.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list--- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with'unsubscribe' in the subject field OR by logging into www.freelists.org- Online, searchable archives are available at //www.freelists.org/archives/rollei_list
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