Archived posting to the Leica Users Group, 2010/08/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Practically speaking, correct, you will not be able to get such subjects into focus, no matter what movements, diaphragm setting or bellows focus you choose (except, of course, if you choose *no* movements, but that is cheating in this context). Take a look at Merklinger's animations to get a feel for how it can be. The Scheimpflug and Hinge Rules in combination are the why. On 11 August 2010 16:10, Bob Adler <rgacpa at yahoo.com> wrote: > Piers, > Thanks for turning a light on in my head. I always wondered why it was so > difficult to get NEAR objects above and below the plane of focus into > focus by > stopping down. Am I correct in assuming that above and below the DOF lines > in > the diagram (especially for close objects) can NEVER be put into focus? > Thanks, > Bob > Bob Adler > Palo Alto, CA > http://www.rgaphoto.com > > > > > ________________________________ > From: "piers at hemy.org" <piers.hemy at gmail.com> > To: Leica Users Group <lug at leica-users.org> > Sent: Wed, August 11, 2010 7:15:23 AM > Subject: Re: [Leica] Tilt-Shift Miniatures > > No, Mark's assertion is a) an oversimplification or b) a misunderstanding > of > the subtlety of the view camera. In any event, it is incorrect, in that as > you tilt the lens, the "depth of field" does not stay the same (being a > space whose front and rear planes are parallel to one another). As you tilt > the lens, the front and rear planes of the "depth of field" also tilt, but > in opposite directions to one another, so the space becomes wedge shaped. > Take a look at http://preview.tinyurl.com/233cq2a for an online calculator > for view camera DoF (even though the webpage is now, als, offline - that > link is via the Wayback machine). > > On 11 August 2010 14:51, Tim Gray <tgray at 125px.com> wrote: > > > On Aug 10, 2010 at 05:12 PM -0400, Mark Rabiner wrote: > > > >> The DOF depth of field stays the same but the plane it lays on changes. > >> You have the plane of field skim over the tops of things. > >> > > > > Correct. I should have been more precise in my wording. However, it > > mimics a shallow depth of field - at least to the regular viewer with no > > knowledge of tilt-shift. > > > > I still stand by my comment. This effect relies on creating the > impression > > of a *photograph* of miniatures, and not of the impression of miniatures > > themselves. > > > > > > _______________________________________________ > > Leica Users Group. > > See http://leica-users.org/mailman/listinfo/lug for more information > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >