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are all ccds 4/3 ??


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#1 sam williams

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Posted 19 September 2008 - 01:31 AM

hi,

im a bit confused about ccd sensors. Looking on wikipedia i found that they all had aspect ratios 4/3. why is this?. I dont undersand how they work, but cant they be made wider, or is that where anamorphic lenses come in?, if so how do they work?


thankyou
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#2 Nathan Martin

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Posted 19 September 2008 - 03:57 AM

Wikipedia has lied to you.
there are lots of cameras with native 16:9 ccd censors.
The standard for dv cameras before about 5 years ago was a 4:3 native 3 ccd arangement. But thats only because the broadcast standard was 4:3.
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#3 Nate Downes

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Posted 19 September 2008 - 06:43 AM

There are CCD's with a wide variety of aspect ratios, ranging anywhere from 1x4000 to fully square. Now, 4:3 is the most popular, for the reasons Nate up there already said. But yes, there are more options than just 4:3
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#4 Nate Downes

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Posted 19 September 2008 - 07:25 AM

There are CCD's with a wide variety of aspect ratios, ranging anywhere from 1x4000 to fully square. Now, 4:3 is the most popular, for the reasons Nate up there already said. But yes, there are more options than just 4:3
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#5 sam williams

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Posted 19 September 2008 - 07:47 AM

There are CCD's with a wide variety of aspect ratios, ranging anywhere from 1x4000 to fully square. Now, 4:3 is the most popular, for the reasons Nate up there already said. But yes, there are more options than just 4:3


thanks for your swift replies guys, could you tell me then how anamorphic lenses are used, is it to emulate having a wider ccd sensor for those who cant afford, and when the footage is unsquished is it then like 1/2 the horizontal quality it once was?

also can you use anamorphic lenses with film as well?

thanks
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#6 Chris D Walker

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Posted 19 September 2008 - 08:07 AM

thanks for your swift replies guys, could you tell me then how anamorphic lenses are used, is it to emulate having a wider ccd sensor for those who cant afford, and when the footage is unsquished is it then like 1/2 the horizontal quality it once was?

also can you use anamorphic lenses with film as well?

thanks


A lot of films are have been shot with anamorphic lenses and still are (Star Wars, Heat, Flags of Our Fathers). They use a 2:1 compression ratio and pass though a 1:1.19 aperture gate to get the 2.39 Scope ratio. When you're in the cinema watching Scope the projector is using an anamorphic lens to restore the image to its original shape for viewing. Often "shooting with Panavision" means using anamorphic lenses.

You can use anamorphics on video but I can't think of any well known film yet that has used them, although the Arri D-21 allows you to use anamorphics in addition to spherical lenses. I don't think there is a anamorphic system for DV cameras but I have heard of 1.33 ratio anamorphics for HD at 16:9 to create a 1:2.37 aspect ratio, very close to 1:2.39.
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