Talk:Filter (optics)

From Wikipedia, the free encyclopedia

	Film Portal This article is within the scope of WikiProject Films. This project is a central gathering of editors working to build comprehensive and detailed articles for film topics on Wikipedia. If you would like to participate, you can edit the article attached to this page, or visit the project page, where you can join the project and/or contribute to the discussion.
Start This article has been rated as Start-Class on the quality scale. ??? This article has not yet received a rating on the priority scale.
Editing Guidelines Please remember these guidelines when editing a film article: If a non-film article already exists with the name of the film that you are trying to create an article for, disambiguate and use (film) in the title: Film Title (film) For more information see: Wikipedia:Naming conventions (films) When writing an article about a particular film, the general format should be a concise lead section, followed by a plot summary of no more than 900 words, production details, a cast list, a reception section, and references. Create an Infobox that tells all pertinent information about the film.
Additional Information: This article has been checked against the following criteria for B-Class status: Referencing and citation: not checked Coverage and accuracy: not checked Structure: not checked Grammar: not checked Supporting materials: not checked To fill out this checklist, please add the following to the template call: <!-- 1. It is suitably referenced, and all major points are appropriately cited. --> |B-Class-1=yes/no <!-- 2. It reasonably covers the topic, and does not contain major omissions or inaccuracies. --> |B-Class-2=yes/no <!-- 3. It has a defined structure, including a lead section and one or more sections of content. --> |B-Class-3=yes/no <!-- 4. It is free from major grammatical errors. --> |B-Class-4=yes/no <!-- 5. It contains appropriate supporting materials, such as an infobox, images, or diagrams. --> |B-Class-5=yes/no Related task forces (general): Filmmaking task force

[edit] Stuff removed

Removed this from the ND filters section:

If such filters are dark enough, they can make looking at the sun safe (don't try this without expert advice!).

Since this is really awful advice. Most ND filters don't block mid-IR very well, so if you look at the sun with them, you're risking cataracts. (You need something like welder's goggles to block MIR). -- DrBob 18:29, 25 Oct 2004 (UTC)

Heh. On that note I found this really cool idea that involves the converse - taking a solar filter and using it as an ND filter (it just happened to be close to neutral density, I guess solar filters don't have to be in general): [1] Rawling 14:25, 11 December 2006 (UTC)

[edit] Definition of positive vs. negative filter?

I was looking for information about what a positive vs. negative filter would be. It surprised me that nothing touching on that aspect appeared in this article. I am pretty sure this applies to optics, in the way of filters that would either remove a certain color of light, or every other color. Mea 15:45, 2 November 2007 (UTC)