2/3 Sensor Mult factor at DVinfo.net

Mat Thompson · January 18th, 2008, 07:54 AM

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?

Dale Guthormsen · January 18th, 2008, 08:14 AM

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!!

Gordon Hoffman · January 18th, 2008, 10:04 AM

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

Mat Thompson · January 19th, 2008, 06:59 AM

Cheers Gordon, thats interesting. Am I being a bit dull if I ask where the ccd numbers have come from?

Gordon Hoffman · January 19th, 2008, 05:43 PM

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

Gordon

Alkim Un · February 14th, 2008, 05:24 PM

Quote:

Originally Posted by Gordon Hoffman

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.

alkim.

Gordon Hoffman · February 17th, 2008, 08:25 AM

Hi Alkim. I believe it's around 5.4.

Gordon

January 18th, 2008, 07:54 AM	#1
Mat Thompson Trustee Join Date: Sep 2006 Location: Kent UK Posts: 1,397	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?

January 18th, 2008, 08:14 AM	#2
Dale Guthormsen Inner Circle Join Date: Jun 2005 Location: Saskatchewan Posts: 3,048	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!! __________________ DATS ALL FOLKS Dale W. Guthormsen

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January 18th, 2008, 10:04 AM	#3
Gordon Hoffman Major Player Join Date: Dec 2005 Location: Pincher Creek, Alberta Canada Posts: 619	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

January 19th, 2008, 06:59 AM	#4
Mat Thompson Trustee Join Date: Sep 2006 Location: Kent UK Posts: 1,397	Cheers Gordon, thats interesting. Am I being a bit dull if I ask where the ccd numbers have come from?

January 19th, 2008, 05:43 PM	#5
Gordon Hoffman Major Player Join Date: Dec 2005 Location: Pincher Creek, Alberta Canada Posts: 619	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 Gordon

February 17th, 2008, 08:25 AM	#7
Gordon Hoffman Major Player Join Date: Dec 2005 Location: Pincher Creek, Alberta Canada Posts: 619	Hi Alkim. I believe it's around 5.4. Gordon