CCD sizes

Samuel Birkan · September 23rd, 2004, 09:28 AM

Looking at the info on the ccd of the TRV950. I understand that a bigger ccd is better so 1\3 is better than 1\4 ect.
But is 1\4.7 closer to 1\3 or 1\5.
Excuse my asking but math was never my strong point

Boyd Ostroff · September 23rd, 2004, 10:25 AM

Hey, you got your backslash and forward slash confused... you must be a DOS user! ;-)

Seriously, 1/4.7" is sort of meaningless except as a basis for comparison. Like all fractions, as the number on the bottom gets larger, the measurement is smaller. So 1/4.7 is smaller than 1/4 but larger than 1/5. I agree it's confusing. The following article refers to digital still cameras, but may help explain a little: http://www.dpreview.com/news/0210/02...ensorsizes.asp

That table doesn't list some of the smaller ccd sizes. As a point of reference, the actual size (diagonal measurement) of the PDX-10/TRV-950 1/4.7" CCD's is 3.8 mm. A 1/4" CCD is 4mm and a 1/3" CCD is 6mm. So as you can see, a 1/3" CCD is significantly larger than what we have in our TRV-950's and PDX-10's...

Tom Hardwick · September 28th, 2004, 10:47 AM

Because the diagonal of the 35mm frame is 43mm, you can take that as its 'normal' lens. The diagonal of a 1/4" chip is 4.1mm and for a 1/3" chip is 5.5mm, so their 'standard lenses' should be those focal lengths. The 1/3" chip is actually 4.4mm x 3.3mm, so 1/3" doesn't really feature there much at all.

tom.

September 23rd, 2004, 09:28 AM	#1
Samuel Birkan Regular Crew Join Date: Sep 2004 Location: Cincinnati Ohio Posts: 79	CCD sizes - what is 1\4.7 Looking at the info on the ccd of the TRV950. I understand that a bigger ccd is better so 1\3 is better than 1\4 ect. But is 1\4.7 closer to 1\3 or 1\5. Excuse my asking but math was never my strong point

September 23rd, 2004, 10:25 AM	#2
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,802	Hey, you got your backslash and forward slash confused... you must be a DOS user! ;-) Seriously, 1/4.7" is sort of meaningless except as a basis for comparison. Like all fractions, as the number on the bottom gets larger, the measurement is smaller. So 1/4.7 is smaller than 1/4 but larger than 1/5. I agree it's confusing. The following article refers to digital still cameras, but may help explain a little: http://www.dpreview.com/news/0210/02...ensorsizes.asp That table doesn't list some of the smaller ccd sizes. As a point of reference, the actual size (diagonal measurement) of the PDX-10/TRV-950 1/4.7" CCD's is 3.8 mm. A 1/4" CCD is 4mm and a 1/3" CCD is 6mm. So as you can see, a 1/3" CCD is significantly larger than what we have in our TRV-950's and PDX-10's...

September 28th, 2004, 10:47 AM	#3
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	Because the diagonal of the 35mm frame is 43mm, you can take that as its 'normal' lens. The diagonal of a 1/4" chip is 4.1mm and for a 1/3" chip is 5.5mm, so their 'standard lenses' should be those focal lengths. The 1/3" chip is actually 4.4mm x 3.3mm, so 1/3" doesn't really feature there much at all. tom.