Talk:Fisheye lens

Image

The image is not an example of a photo from a fisheye lens !! The Tiananmen Square was clearly captured as multiple images and stitched together to create a panorama.

Somebody should post a "real" fisheye image to better demonstrate the curvature effect. I would but all my lenses are rectilinear :-( —Preceding unsigned comment added by 194.232.128.103 (talk • contribs) 2005-05-02

It seems that the above comment refers to a previous photo. The current photo (a room with all 4 walls visible) seems to be a "real" fisheye image... —Preceding unsigned comment added by 82.67.71.141 (talk • contribs) 2005-08-10

Filmmaking project?

Consistent with the position I took in the discussion section on wide angle lenses, I cannot understand why the editors would choose the fisheye lens for incorporation into the Filmmaking project. Has anyone seen any significant use of a fisheye lens in motion picture production? Are they even made for motion picture cameras? 67.190.55.164 05:40, 16 October 2006 (UTC)

I've seen them used in movies about drug addicts. Can't think of any titles off the top of my head because I hate movies about drug addicts, but yes, they are made for and used in film. -seinman 06:11, 16 October 2006 (UTC)

There's always 2001: A Space Odyssey and HAL's "eyes" around the ship. Fisheyes often show up in music video clips, especially hip-hop. Fisheyes are also used for IMAX Dome/OMNIMAX to capture a very wide field of view and to then project it onto the inside of a dome. --Imroy 07:08, 16 October 2006 (UTC)

Seinman and Imroy. Thanks for your examples. I'm really don't want to be too argumentative about this but in what percentage of movies do you think fisheye lenses are used? Do you think its high enough to merit including them in this project?Anoneditor 22:08, 19 October 2006 (UTC)

I don't really follow wp filmmaking, so I don't really have an answer to that question. Fisheyes are much more prevalent in video, especially skateboarding/snowboarding/BMX videos. Is there any sort of wikiproject that covers something like that, which could be a better fit, perhaps? -seinman 22:23, 19 October 2006 (UTC)

I'd say them being used in 2001: A Space Odyssey alone merits the articles inclusion in the filmmaking project. But IANAFM. W 08:35, 25 May 2007 (UTC)

The film "Hot Shots" has a guy with "Wall-eye vision". Filmed using fish-eye lens. Also, any film in which they show a sequence through a "peep-hole" on a front door. 140.203.8.209 (talk) 16:00, 21 March 2008 (UTC)

For what it's worth, Danger: Diabolik and In Like Flint - both from the late 1960s - used fisheye lenses in a few sequences. It seems to have been a popular fad effect in the late 1960s, early 1970s; I assume such lenses must have been available cheaply to hire. Presumably with the rise of HD video recording in digital SLRs, the fisheye perspective will appear more and more often. As mentioned above, it's a very cheap way of mocking up a "robot's eye vision" effect. -Ashley Pomeroy (talk) 13:12, 5 July 2009 (UTC)

Pinhole camera fisheye

A generalized pinhole camera having different refractive indexes on either side of the pinhole can perform either a fisheye or telephoto lens function.

In this case, the radius from the center of the focal plane is still $R=f\tan \theta$ as with any pinhole camera, only $\theta$ is a nonlinear function of the refractive indexes and the position of the point to be projected: $\theta =\arcsin {\left({\frac {n_{t}}{n_{f}}}\sin {\theta _{t}}\right)}$, where $n_{t}$ and $n_{f}$ are the refractive indexes on the target and focal plane sides, respectively, and $\theta _{t}$ is the angle from the viewing axis to the the point to be projected, assuming the pinhole is at the origin.

If $n_{t}<n_{f}$ you have a fisheye pinhole lens. If $n_{t}>n_{f}$ you have a telephoto pinhole lens. Only in the special case $n_{t}=n_{f}$ do you get distortion-free straight lines.

Of course, the chromatic aberration in such a lens would be terrible, but it's obvious that a fisheye effect can be accomplished with a pinhole, and it's easy to simulate such a lens in a computer without the aberration effects.

Is this too obscure, or is it worth mentioning this aspect of a pinhole camera? -Amatulić (talk) 01:53, 19 January 2008 (UTC)

Link to olypedia.de

Sorry, but olypedia.de is not spam, promotion or any other (we say in german) "Quatsch". It is THE german free wiki about olympus - nothing to do with olympus co! You find here many informations about olympus, that you can not find in en.wikipedia.org or other wikis. The most of the autors came from germany, for many of them (also my person) is english not a favorite language.

I try again....

Sorry - my english is for runaways...

Best regards from the lower rhine in germany rudolfo42 (http://olypedia.de/Benutzer:Rudolfo4)

"moderately wide angles of view"

What about some focal length figures (in 35mm, to be sure) for "moderate wide angles of view" in the lead? And maybe a formula/table for the relation between focal length and angle of view in 35mm? Terry Gilliam frequently uses extremely wide lenses (9.8mm Kinoptic, 8mm Zeiss...) which show no fisheye barrel distortion at all because they're rectilinear-corrected. What he's going for is no barrel distortion but more complex perspective distortion instead. Most people seem to think any fisheye would just be an ultra-wide angle, but there's definitely a difference between a rectilinear 8mm and a fisheye lens. Probably a disclaimer might be in order, here and in other articles, that ultra-wide angle doesn't necessarily equal fisheye. --79.193.62.79 (talk) 03:40, 3 January 2010 (UTC)

Nikon 16mm missing?

Just noticed that Nikon 16mm f/2.8D AF Fisheye-NIKKOR was missing in a fullframe list. 16mm Fish-eye. Its strange since its a real fullframe fish-eye. Gcardinal (talk) 22:01, 21 November 2010 (UTC)