Leica; "4/3rds quality just not there."
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From: bart.c on 25 May 2010 05:05 "nospam" <nospam(a)nospam.invalid> wrote in message news:240520101555566255%nospam(a)nospam.invalid... > In article > <e27b5562-e1b8-42e0-89cc-cb866e73d608(a)v29g2000prb.googlegroups.com>, > Bob G <mrbobjames(a)yahoo.com> wrote: > >> I can't see "4/3" being registered by anyone, "Four Thirds" maybe. > > 4/3 is shorthand or an abbreviation for four thirds, just as m43 or mft > is shorthand for micro four thirds. > >> And 4/3 is not a size, merely a ratio. > > it's a size. > >> The size of the "4/3" sensor is approx. 18mm x 13.5mm, not 1.333... > > the entire sensor is 4/3 of an inch, although the actual light > sensitive area is smaller. > > <http://www.olympus-europa.com/consumer/dslr_7045.htm> > > Four Thirds is a reference to the size of the image sensor. The image > sensor for Four Thirds cameras is what is commonly referred to as a > 4/3 type or 4/3 type sensor. > >> And why not call it the "Three Fourths" (3/4) sensor, anyway? It's the >> same thing, isn't it? > > no. 3/4 is less than 4/3. > >> But I think we're fighting over names and not concepts. By a "full- >> frame" 4/3 sensor I meant a larger sensor 24x32mm2, its sides in the >> proportion 3:4, that's all. > > full frame means 24 x 36 mm. 4/3 can never be that big. 4/3 could never use a 27 x 36 mm sensor? -- Bartc
From: David J. Littleboy on 25 May 2010 06:17 "bart.c" <bartc(a)freeuk.com> wrote: > "nospam" <nospam(a)nospam.invalid> wrote in message >> Bob G <mrbobjames(a)yahoo.com> wrote: >> >>> I can't see "4/3" being registered by anyone, "Four Thirds" maybe. >> >> 4/3 is shorthand or an abbreviation for four thirds, just as m43 or mft >> is shorthand for micro four thirds. >> >>> And 4/3 is not a size, merely a ratio. >> >> it's a size. >> >>> The size of the "4/3" sensor is approx. 18mm x 13.5mm, not 1.333... >> >> the entire sensor is 4/3 of an inch, although the actual light >> sensitive area is smaller. >> >> <http://www.olympus-europa.com/consumer/dslr_7045.htm> >> >> Four Thirds is a reference to the size of the image sensor. The image >> sensor for Four Thirds cameras is what is commonly referred to as a >> 4/3 type or 4/3 type sensor. >> >>> And why not call it the "Three Fourths" (3/4) sensor, anyway? It's the >>> same thing, isn't it? >> >> no. 3/4 is less than 4/3. >> >>> But I think we're fighting over names and not concepts. By a "full- >>> frame" 4/3 sensor I meant a larger sensor 24x32mm2, its sides in the >>> proportion 3:4, that's all. >> >> full frame means 24 x 36 mm. 4/3 can never be that big. > > 4/3 could never use a 27 x 36 mm sensor? No, never. "4/3" is a _size_: 17.3�13.0 mm (21.63 mm diagonal). http://en.wikipedia.org/wiki/4/3 -- David J. Littleboy Tokyo, Japan
From: Alfred Molon on 25 May 2010 07:23 In article <d9cdc081-af06-4055-96b4-2c4ddc14b186 @c13g2000vbr.googlegroups.com>, Bob G says... > Full-frame four thirds: 24mm x 32mm Why not 27 x 36mm? -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: nate bishop on 25 May 2010 07:56 On Tue, 25 May 2010 13:23:29 +0200, Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <d9cdc081-af06-4055-96b4-2c4ddc14b186 >@c13g2000vbr.googlegroups.com>, Bob G says... >> Full-frame four thirds: 24mm x 32mm > >Why not 27 x 36mm? Because the diagonal is not four 1/3rds (1.33) inches. The diagonal of those dimension is 1.77 inches.
From: Bruce on 25 May 2010 08:58
On Mon, 24 May 2010 12:51:49 -0700 (PDT), Bob G <mrbobjames(a)yahoo.com> wrote: >On May 24, 2:45�pm, nospam <nos...(a)nospam.invalid> wrote: >> In article >> >> >> 4/3rs can never be full frame. it's maximum size is what it is. it can >> never be any bigger. > >4/3 is an artihmetic ratio - unless it's been registered as a >proprietary name (which I doubt), it can be applied to any rectangular- >shaped object that satisfies it. Four Thirds was much more than just an arithmetic ratio. The Four Thirds in the DSLR camera system referred not only to the aspect ratio of the sensor but also the size of the die used to make the sensor. Some critical dimension of the die (I don't know which) was expressed as Four Thirds of an inch. |