Before the rush

Before the rush
by evan-pak

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Most of the time the shape of the flare is close to a circle, but recently I saw a movie where the lens flare was elliptically shaped. The stills below, taken from the movie Die Hard, show the effect I am referring to.

enter image description here

enter image description here

What in the lens design is responsible for this elliptical shape?

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there are many possible causes including light source incidence angle, aperture shape, lens element shape, and light source shape, can you supply an example of what you have seen so we can try to answer better? – Digital Lightcraft Jan 1 '13 at 22:22
Thanks for updating the question, interesting: it seems to be caused by the acute angle to a long telephoto lens as far as i can tell, it doesnt appear to be a vertically compressed frame either. But I'm not sure if there are any other underlying effects caused by this being a movie camera / lens (there could be significant differences in lens and/or shutter design that are inherent to movie vs still cameras) ETA: Die hard - very seasonal :-D – Digital Lightcraft Jan 1 '13 at 23:17
up vote 5 down vote accepted

The elliptical flares were probably from an anamorphic lens. These lenses squash the image horizontally in order to get a widescreen picture on a standard width film strip. The anamorphic elements are usually on the front of the lens so the lens barrel appears elliptical to the camera.

Lens flares are just reflections so can take the shape of any lens component but the most common source of reflections are the glass elements so flares tend to be either circular or take the shape of the aperture.

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Yeah, as @Matt Grum said, an anamorphic lens is likely to cause this. From here, this is what one looks like: – BBking Jan 2 '13 at 2:41

Movies typically use an aspect ratio that's wider than the frame on the film, so lenses are used to compress the image in the horizontal dimension. You're probably familiar with some of the brand names Cinemascope and Panavision -- these are lens systems that were/are used to record a wide image onto standard film, and then to project it again. This may explain the elliptical lens flare in the image. I'm not fully convinced of this myself -- one would think that a circular lens flare in the camera would be converted to a vertical ellipse on the film and then back to a circle upon projection, but who knows how the light bounced around in the lens?

Another example of something that seems similar is the holes that used to be punched in films to tell the projectionist to switch to the next reel. The holes were circular, but they appeared elliptical on the screen due to the lenses.

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Are you referring to cigarette burns when you're writing about the holes the projectionists punched into films? – Saaru Lindestøkke Jan 2 '13 at 0:17
@BartArondson I was talking about cue marks added by the processing lab. – Caleb Jan 2 '13 at 0:27

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