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Old January 18th, 2008, 07:54 AM   #1
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2/3 Sensor Mult factor

Hi guys
Just a quick question someone may be able to clear up. With a 1/3 sensor the mult factor is 7.2 when using 35mm film lenses. So what is the mult factor when considering 2/3 chips? There mult be a formula I guess but I haven't been able to find anything?
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Old January 18th, 2008, 08:14 AM   #2
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Mat,

what a great question.

sense it is twice as big would it cut it down to 3.6?

Or does it reduce 7.2 by a third which makes it 4.824?


Probably something totally different. Waiting to hear on this one too!!
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Old January 18th, 2008, 10:04 AM   #3
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Mat
I believe you divide the 35mm diagonal measurement by the diagonal measurement of the ccd being used to get the crop factor.
eg 43.3(35mm)/11(2/3)= 3.9
eg 43.3(35)/6(1/3)= 7.2

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Old January 19th, 2008, 06:59 AM   #4
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Cheers Gordon, thats interesting. Am I being a bit dull if I ask where the ccd numbers have come from?
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Old January 19th, 2008, 05:43 PM   #5
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Mat not at all. This dicussion has a link to a site that seems to agree with what they came up with.
http://dvinfo.net/conf/showthread.php?t=13433

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Old February 14th, 2008, 05:24 PM   #6
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Quote:
Originally Posted by Gordon Hoffman View Post
Mat
I believe you divide the 35mm diagonal measurement by the diagonal measurement of the ccd being used to get the crop factor.
eg 43.3(35mm)/11(2/3)= 3.9
eg 43.3(35)/6(1/3)= 7.2

Gordon Hoffman
then 1/2 inch cam gives 5.5 mult. factor with same calculation.

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Old February 17th, 2008, 08:25 AM   #7
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Hi Alkim. I believe it's around 5.4.

Gordon
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