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Can someone explain vertical oval highlights from anamorphic lenses??
Old 1 Week Ago   #1
mabelsound
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Can someone explain vertical oval highlights from anamorphic lenses??

Just saw Moonlight, which I highly recommend to everyone here—it's a great movie, with amazing writing and acting. But the photography is especially terrific. The cinematographer, James Laxton, uses anamorphics throughout, along with one very strange lens that keeps only the middle of the frame in focus, with the top and bottom blurred,— in an almost shift-like effect. It's very evocative.



Here's the trailer.



Anyway. I cannot wrap my brain around why anamorphics render vertically oval highlights. If the in-focus elements of the frame are normally proportioned, why aren't the out-of-focus ones, too? If the highlights are going to be distorted at all, I'd expect the them to be oval horizontally, that is, in response to the lateral stretching of the frame.







You can kind of see this effect in action when focus in a shot shifts from a background object to one in the foreground; as the foreground comes into focus, the background objects seem to laterally contract.



I understand, broadly speaking, how anamorphics work, but I just can't comprehend why objects at different distances would respond differently to the process. Can anyone explain it in a straightforward way?
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Old 1 Week Ago   #2
Bill Clark
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Found this:

http://filmmakermagazine.com/100603-.../#.WHL11ctOKhA

How much of what you see took place during the process stage?

spot on the lenses:

https://www.vantagefilm.com/en/produ...hawk-2x/v-lite

http://www.red.com/learn/red-101/anamorphic-lenses

I'm not current with video production but thought I'd point you to these sites.

Maybe this old hat for you?
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Old 1 Week Ago   #3
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I linked to the top article in my post! I didn't see that technical page, though, thank you! The shift effect may indeed have been achieved in post.
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Old 1 Week Ago   #4
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The horizontal oval highlights are common to all anamorphic movies, though.
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Old 1 Week Ago   #5
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Don't know how much info to throw at you but maybe download couple of pdfs on the Vantage site.

Interesting the creativity now and the tools available.
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Old 1 Week Ago   #6
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Because the entrance pupil is oval. It has nothing to do with the stretching.

https://www.quora.com/Why-do-anamorp...uce-oval-bokeh

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Old 1 Week Ago   #7
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Quote:
Originally Posted by Freakscene View Post
Because the entrance pupil is oval. It has nothing to do with the stretching.

https://www.quora.com/Why-do-anamorp...uce-oval-bokeh

Marty

Ohhhh wow. But then why doesn't the rendered oval highlight stretch into a circle along with the in-focus elements when the resulting filmed image is processed??
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Old 1 Week Ago   #8
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Ok I think I'm getting it now. The highlights ARE stretched in post, they just start out even narrower to begin with. I guess in that case my question is, why have the oval pupil in the first place?
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Old 1 Week Ago   #9
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Could it be because of how the movies are projected?
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Old 1 Week Ago   #10
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It's oval in how the image is projected on to the film when the image is captured. They capture anamorphic to get shallower DOF because essentially what they do is fake a larger/wider capturing medium by compressing the image.

The artifacts of using anamorphic lenses such as the bokeh and highlight shape are attributes carried over from the lens shape as noted earlier. It's one of those things that remains even when the image is brought back to the proper aspect ratio.

http://www.red.com/learn/red-101/anamorphic-lenses
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