Talk:Depth of focus

	Film portal This article is within the scope of WikiProject Film. If you would like to participate, please visit the project page, where you can join the discussion and see lists of open tasks and regional and topical task forces. To use this banner, please refer to the documentation. To improve this article, please refer to the guidelines.FilmWikipedia:WikiProject FilmTemplate:WikiProject Filmfilm articles
	This article is supported by the Filmmaking task force.

Physics Low‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles
Low	This article has been rated as Low-importance on the project's importance scale.

Is it really necessary to use the non-metric units at all? And if so, why always name them before the metric ones?

It is no more necessary to use one than the other - but it is relevant to the conversation that both are commonly in usage in photography. There is no intended bias by naming one before the other, nor does it matter, so long as both exist. Furthermore, manual of style dictates that multiple systems should be embraced in order to further accessibility to readers from around the world, and deletion of other units is generally frowned upon. By the way, you can benefit greatly from discussions by joining the Wikipedia community with a username and signing your comments with ~~~~ (four tildes). Thanks! Girolamo Savonarola 20:24, 24 March 2006 (UTC)[reply]

I've been using cameras for over 60 years, and I have some that are up to 75 years old. In that time I have never come across anything that measures in US Customary or Imperial units. It would be good to come up with a reference that uses these units, or just to remove all mention of them. Groogle (talk) 02:49, 14 April 2024 (UTC)[reply]

Merge with Depth of field[edit]

Both articles seem to be on the same subject - the optical phenomenon of one thing being critically focused, and other thing in front and behind falling gradually out of focus. A portrait, as contrasted with a landscape.

Wikipedia ( and its readers ) would benefit from taking the best parts of both articles, and consolidating them. And the people who are donating their time to improve WP won't be duplicating work. ForrestCroce 17:29, 20 December 2006 (UTC)[reply]

The concepts are closely related, but certainly not the same. The applications are different. The equations are differnet. Still, one could cover depth of focus in the depth of field article is one wanted to. Anyone else have an opinion on this? Dicklyon 22:25, 20 December 2006 (UTC)[reply]

I don't want to sound contentious, but you're using different words to describe the same thing. As light is projected from a lens, it's focused on a plane, and defocused on other planes, more and more so the further away they are from the point of focus. It's true most photographers give more attention to DOF on the subject-side of the lens than on the film-plane side, but in both cases the same thing is going on. If you take a picture and your subject is out of focus, something on another plane - close to the camera or further away - is in focus. A lot of medium and large format cameras are focused by moving the film plane.

The butterfly graphic kind of describes this, but some of the diagrams of the light path through a lens, being reversed and all, do a better job of explaining how behind/in front of the lens is related. So, these are the reasons I think the two DOF articles are the same, and that wikipedia would benefit from merging the best parts of both of them. I'll give up the floor now. ForrestCroce 01:42, 21 December 2006 (UTC)[reply]

Oppose - They are different concepts, and they each deserve separate articles, not in the least in order to prevent them being confused or mislabeled. They have different effects. Should every physical property of a lens belong on the same page? If it were merging to a larger article, such as optics, as a subsection, there might be some merit. However, depth of field and depth of focus are two different but comparable concepts. Are a negative and print the same thing? After all, they both require development...

As for medium and large format cameras, they are moving the lens and film plane in relation to each other, which is essentially what lenses with focusing elements do internally - the depth of focus concept is specifically tied into the concept of flange focal distance and back focus - ie, the relation of a fixed lens mount to the film plane. It's a technical consideration, not an artistic one like depth of field. Girolamo Savonarola 20:57, 21 December 2006 (UTC)[reply]

Oppose for the reasons given above. --MichaelMaggs 10:22, 18 January 2007 (UTC)[reply]

Yet-to-be-published sources[edit]

I also question the propriety of including a source several months before it's published, and was initially frustrated to see that no publication date was given, and that all queries for the ISBN failed. It finally occurred to me that it has yet to be published, which a further search confirmed. Assuming that Alipson is one of the authors, the work may be presumptively reliable but at this time is unverifiable. I think a good case could be made for removing (or at least commenting out) such a source until publication. If the ref is retained, I think the link to the publisher's site is essential, because without it, there's no way to find anything about the book or even tell whether the reference is real, and unless there's some good reason for removing it, I'm going to restore it.

I am generally of the opinion that without a page number, a reference is essentially unverifiable, but perhaps one is not yet available. Perhaps Alipson can provide one; I presume he will get a gratis copy as soon as it's published. JeffConrad (talk) 07:26, 14 March 2010 (UTC)[reply]

Calculation[edit]

The section on calculation, as it stands, calculates depth of field, not depth of focus. I'm still trying to get my head around depth of focus; if somebody could fix this section, it would be good, otherwise I'll try when I understand it well enough. Groogle (talk) 02:49, 14 April 2024 (UTC)[reply]