Leica; "4/3rds quality just not there."
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From: Bob G on 25 May 2010 13:28 > > Sensor sizes are named, defined, and measured by their diagonal in inches. > Go educate yourself. The diagonal of a rectangle of sides a and b is given by this equation: diagonal = square root of (a squared + b squared) There's an infinite number of solutions for a and b for any given diagonal. The solution becomes unique only when you specify a relationship between a and b, such as a:b :: 3:4, or 2:3, or 1:1, or... So, it is not true that a diagonal, alone by itself defines the size of the sensor. You must also give the aspect ratio.
From: nate bishop on 25 May 2010 13:37 On Tue, 25 May 2010 19:16:28 +0200, Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <mdpnv5df5nfsmc4904vp4hv09b30a4rtde(a)4ax.com>, nate bishop >says... > >> >In article <pdenv5tio4br3hhidum2p02oje7toh5n53(a)4ax.com>, nate bishop >> >says... >> >> Because the diagonal is not four 1/3rds (1.33) inches. The diagonal of >> >> those dimension is 1.77 inches. >> > >> >The aspect ratio is. The diagonal is irrelevant. >> >> Sensor sizes are named, defined, and measured by their diagonal in inches. >> Go educate yourself. > >LOL - you educate yourself. Sensor sizes are measured in width and >length. Oh really. Then tell me, why are they listed in all camera reviews, in manuals, and even on the boxes they come in, with sensor sizes of 1/3.6, 1/3.2, 1/3, 1/2.7, 1/2.5, 1/2.3, 1/2, 1/1.8, 1/1.7, 2/3, 1/1, 4/3, 1.8, etc. Since you're too stupid to even go educate yourself, I'll take pity on you. Read this: http://www.dpreview.com/learn/?/Glossary/Camera_System/sensor_sizes_01.htm I'll put you in my filters labeled: "Too stupid to even go educate himself." You're not alone in there.
From: Bruce on 25 May 2010 13:43 On Tue, 25 May 2010 16:41:44 +0200, Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <pdenv5tio4br3hhidum2p02oje7toh5n53(a)4ax.com>, nate bishop >says... >> Because the diagonal is not four 1/3rds (1.33) inches. The diagonal of >> those dimension is 1.77 inches. > >The aspect ratio is. The diagonal is irrelevant. That's a surprising statement from someone who actively promotes a Four Thirds discussion group. From the outset, Four Thirds referred not only to the aspect ratio, but also to the nominal size of a key factor in manufacturing the sensors. Whether it was the blank, or a die, or something else I cannot recall. But it was used to define the sensor size as well as the aspect ratio.
From: John Navas on 25 May 2010 14:08 On Tue, 25 May 2010 18:43:45 +0100, Bruce <docnews2011(a)gmail.com> wrote in <0r2ov5ho7itdc3k6vkst9j2p4jm42v94co(a)4ax.com>: >On Tue, 25 May 2010 16:41:44 +0200, Alfred Molon ><alfred_molon(a)yahoo.com> wrote: > >>In article <pdenv5tio4br3hhidum2p02oje7toh5n53(a)4ax.com>, nate bishop >>says... >>> Because the diagonal is not four 1/3rds (1.33) inches. The diagonal of >>> those dimension is 1.77 inches. >> >>The aspect ratio is. The diagonal is irrelevant. > >That's a surprising statement from someone who actively promotes a >Four Thirds discussion group. > >From the outset, Four Thirds referred not only to the aspect ratio, >but also to the nominal size of a key factor in manufacturing the >sensors. Whether it was the blank, or a die, or something else I >cannot recall. But it was used to define the sensor size as well as >the aspect ratio. <http://www.four-thirds.org/en/fourthirds/whitepaper.html>: Size of the 4/3-type Sensor The standard diagonal length of the sensor is 21.63 mm. It is half that of 35-mm film format (36 mm x 24 mm) and suitable format for professional use in digital age. The image circle of the interchangeable lens is specified based on this diagonal length. <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. These describe the type of sensor not the actual size of the light sensitive area, which is normally much smaller The sensor measures approximately 22.3mm diagonally, not four-thirds of an inch, which would be about 33.87mm. Traditionally, the nominal size of image-sensing devices has been based on a method of calculation that was introduced when vacuum image-sensing tubes were first invented. At the time, the outer diameter of these early 'vidicon' tubes was used to indicate their size. Unfortunately, this convention has remained despite the many advances in imaging technology that have since been made, and so the designation, "a four-thirds-inch sensor," can be a source of confusion. For this reason, many people now prefer to use the word "type" instead of "inch" when discussing the size of digital image sensors. -- Best regards, John Buying a dSLR doesn't make you a photographer, it makes you a dSLR owner. "The single most important component of a camera is the twelve inches behind it." -Ansel Adams
From: John Navas on 25 May 2010 14:24
On Tue, 25 May 2010 11:08:04 -0700, John Navas <jnspam1(a)navasgroup.com> wrote in <0c3ov5pv4ge88i3clodpg3ck5kpajmbdnk(a)4ax.com>: >>From the outset, Four Thirds referred not only to the aspect ratio, >>but also to the nominal size of a key factor in manufacturing the >>sensors. Whether it was the blank, or a die, or something else I >>cannot recall. But it was used to define the sensor size as well as >>the aspect ratio. Four Thirds refers only to (image circle) size, not aspect ratio. <http://en.wikipedia.org/wiki/Four_Thirds_system#Sensor_size_and_aspect_ratio>: However, the standard only specifies the sensor diagonal, thus Four Thirds cameras using the standard 3:2 aspect ratio would be possible[5]; notably newer Panasonic Micro Four Thirds models even offer shooting at multiple aspect ratios while maintaining the same image diagonal. For instance, the Panasonic GH1 uses a multi-aspect sensor which is designed to maximize use of the image circle at 4:3, 3:2, and 16:9; each ratio having a diagonal of 22.5mm.[6] -- Best regards, John Buying a dSLR doesn't make you a photographer, it makes you a dSLR owner. "The single most important component of a camera is the twelve inches behind it." -Ansel Adams |