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September 23rd, 2004, 09:28 AM | #1 |
Regular Crew
Join Date: Sep 2004
Location: Cincinnati Ohio
Posts: 79
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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 |
Wrangler
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,798
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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 |
Inner Circle
Join Date: Mar 2003
Location: Billericay, England UK
Posts: 4,711
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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. |
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