Talk:Tilted plane focus

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How do I justify image to right? thanks sinarau 13:36, 18 April 2007 (UTC)

this is an example
Put 'right' in the list of options you give when using the image; the example here was coded as [[Image:example.svg|right|this is an example]]. You might also want to use 'thumb' to make the image into a thumbnail. Hope that helps! --ais523 14:06, 18 April 2007 (UTC)

This material is a valuable addition to WP, but I find the title a bit confusing; I think it would be more clear if it were "tilted-plane focus" (as implied by the original editor's web site) or perhaps "tilted plane of focus". Even so, it's not a common term--a Google search shows only the original editor's web page. I'm not sure there really is a good common term, but most people tend to think of it as "Scheimpflug", strictly correct or not; I wonder if this material should be merged into the Scheimpflug article--I think a reader would be more likely to find it there.

It looks to me as if there are a few technical issues as well:

  • Depth of focus (allowable displacement of the image plane for a fixed object distance) is used where I think depth of field (object-side region that appears sharp for a fixed image distance) is meant.
  • It's stated that DoF "permits bringing into focus objects at varying distances from the camera". This isn't quite true; objects within the DoF appear to be in focus under "normal" viewing conditions, but focus is really achieved only for one plane. It's perhaps a small distinction, but one that's nonetheless important, especially because there isn't universal aggreement on what consititutes "normal" viewing conditions.
  • It isn't quite correct to state that a wide-angle lens has great DoF and that telephoto lens has shallow DoF; it depends upon subject framing. When magnification is the same, all lenses in given format at a given f-number have approximately the same DoF. JeffConrad 04:40, 24 April 2007 (UTC)

Jeff, thanks for these thoughtful comments. I actually do mean 'depth of focus' because it is the displacement of the image plane with which I am concerned (affected through tilting of both lens and film panels). Yes DOF needs qualification - will attend to this. I would be happy to rename the page 'tilted-plane' focus but feel that if merged with 'Scheimpflug' the potential of this technique, which I hope will be of use to others, might be lost.[[sinarau 14:01, 24 April 2007 (UTC)]]

James, selective focus still relates to depth of field, regardless of how you tilt the lens or image planes. Depth of focus is a completely different issue; it might be appropriate when discussing the effects of film buckling.
Your comment about merging with Scheimpflug raises a question about the intent of this article: is it meant to cover only shallow DOF and not the more general case of rotating the PoF? If so, I've misread it, and will need to revise my last edit to the DoF article. If that's the case, I think almost any permutation of "tilted plane focus" could be confusing; the title should be something that makes it clear that only the shallow DoF is meant. The only term in common use for this seems to be "anti-Scheimpflug", though it's somewhat of a misnomer because it still employs the Scheimpflug principle. This again might be a reason to merge this with the Scheimpflug article. The Scheimpflug principle really relates to rotation of the PoF; the rotation can be such to either maximize or minimize the part of the image that's within the DoF. The Scheimpflug article needs a lot of work; I'll see if I can make a start on it in a few days. JeffConrad 20:55, 24 April 2007 (UTC)