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image sensor sizes

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#1 ccs_hello

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Posted 03 April 2014 - 08:08 PM

Time to add some more popular sensor sizes:

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#2 ccs_hello

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Posted 03 April 2014 - 08:10 PM

And by numbers:
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#3 CounterWeight

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Posted 03 April 2014 - 10:16 PM

This should get a sticky? Nice work on this presentation, like that you added the circles for figuring the diagonal of the flat image field.
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#4 fishonkevin

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Posted 03 April 2014 - 10:37 PM

We get to many stickies with the contests. But I am going to add a link in the 'Best Of' thread, like I did with MR's.
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#5 CounterWeight

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Posted 03 April 2014 - 11:05 PM

Thanks Kevin :)

#6 ccs_hello

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Posted 04 April 2014 - 12:42 AM

Thanks folks :)!

18mm and 25mm diameter circles reflect two most commonly used image intensifier image plane format.

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#7 mmalik

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Posted 04 April 2014 - 02:46 AM

Image circles/sensors...

Attached Thumbnails

  • 6446543-ImageCircles.jpg

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#8 ccs_hello

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Posted 10 January 2017 - 08:11 AM

Just to add the explanation of the type-X format....

 

Image sensor size in inch unit, was originated in the old vacuum tube based image sensor era, e.g., Vidicon.
In that era, the size is based on the required image circle size in optical format.

The name is always preceded by "type-", e.g., type-1" Vidicon tube.
To map to reality, you have to de-rated the number by 66% approx.
Marketing like that (e.g., 1 pound can coffee) thus this representing method stays.

This type of "inflation" is no longer used, when being expressed in KMS format, e.g., a diagonal-6mm image sensor, indeed would have a true diagonal size of 6mm in its imaging area.

Clear Skies!
 

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#9 Alex McConahay

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Posted 10 January 2017 - 08:38 AM

How did the 1/2" (for instance) get its name? Its measurements do not seem to be related to half an inch.

 

Alex



#10 waitingForTheMiracle

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Posted 10 January 2017 - 08:58 AM

The inch-based formats were named from the outer diameter of the vacuum tube that captured the image. The actual image area was quite a bit smaller, partly due to the thickness of the tube walls. 

 

When we got electronic sensors, they continued the naming tradition. So an "x inch" sensor means that if you were to make a vacuum tube with the same actual imaging area, the outer diameter of that tube would need to be around x inch.



#11 Alex McConahay

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Posted 10 January 2017 - 04:03 PM

Thanks......

 

Next question----

 

What is a vacuum tube?

 

(just kidding.)

 

Alex




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