If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#31
|
|||
|
|||
Mitch Alsup wrote:
Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. If camera senseor technology moves forward at the same rate semiconductor technology moves forward, one can expect 10 MP at 1.6 crop in 2 to 2.5 years, and 14 MP at 1.6 crop by the end of the decade. That's all fine, but then why doesn't the more advanced 2/3" CCD of the 8MP prosumer cameras have less noise than the 1/1.8" CCD of 5MP prosumer cameras ? Cell size is almost the same (2.8 micrometer for the 5MP CCD, 2.7 for the 8MP one). But a test shows that the 8MP CCD has slightly higher noise levels - the 8MP CCD has at ISO 50 the same noise as the 5MP CCD at ISO 64. Or do you suggest that there has been only progress in the CMOS area, but none in the CCD area ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html |
#32
|
|||
|
|||
Mitch Alsup wrote:
Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. If camera senseor technology moves forward at the same rate semiconductor technology moves forward, one can expect 10 MP at 1.6 crop in 2 to 2.5 years, and 14 MP at 1.6 crop by the end of the decade. That's all fine, but then why doesn't the more advanced 2/3" CCD of the 8MP prosumer cameras have less noise than the 1/1.8" CCD of 5MP prosumer cameras ? Cell size is almost the same (2.8 micrometer for the 5MP CCD, 2.7 for the 8MP one). But a test shows that the 8MP CCD has slightly higher noise levels - the 8MP CCD has at ISO 50 the same noise as the 5MP CCD at ISO 64. Or do you suggest that there has been only progress in the CMOS area, but none in the CCD area ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html |
#33
|
|||
|
|||
"Alfred Molon" wrote in message
... Mitch Alsup wrote: Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. If camera senseor technology moves forward at the same rate semiconductor technology moves forward, one can expect 10 MP at 1.6 crop in 2 to 2.5 years, and 14 MP at 1.6 crop by the end of the decade. That's all fine, but then why doesn't the more advanced 2/3" CCD of the 8MP prosumer cameras have less noise than the 1/1.8" CCD of 5MP prosumer cameras ? Cell size is almost the same (2.8 micrometer for the 5MP CCD, 2.7 for the 8MP one). But a test shows that the 8MP CCD has slightly higher noise levels - the 8MP CCD has at ISO 50 the same noise as the 5MP CCD at ISO 64. Or do you suggest that there has been only progress in the CMOS area, but none in the CCD area ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html The CMOS has circuitry next to each sensor cell so there are room to improve in this regard, shrinking the size of the electronic components, using better micromirror etc. Still, there's a limit. Let's see what's the optimal pitch size for CMOS sensors. |
#34
|
|||
|
|||
"Alfred Molon" wrote in message
... Mitch Alsup wrote: Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. If camera senseor technology moves forward at the same rate semiconductor technology moves forward, one can expect 10 MP at 1.6 crop in 2 to 2.5 years, and 14 MP at 1.6 crop by the end of the decade. That's all fine, but then why doesn't the more advanced 2/3" CCD of the 8MP prosumer cameras have less noise than the 1/1.8" CCD of 5MP prosumer cameras ? Cell size is almost the same (2.8 micrometer for the 5MP CCD, 2.7 for the 8MP one). But a test shows that the 8MP CCD has slightly higher noise levels - the 8MP CCD has at ISO 50 the same noise as the 5MP CCD at ISO 64. Or do you suggest that there has been only progress in the CMOS area, but none in the CCD area ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html The CMOS has circuitry next to each sensor cell so there are room to improve in this regard, shrinking the size of the electronic components, using better micromirror etc. Still, there's a limit. Let's see what's the optimal pitch size for CMOS sensors. |
#35
|
|||
|
|||
Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. Do you have a patent number and a site where I could download a copy of the patent application. TIA jpc |
#36
|
|||
|
|||
Technology moves forward. For example, is the 2 years since the 6.3 MP with 1.6 crop was introduced, CMOS technology has advance to the point where the transistors associated with each cell are now only 1/2 as big as they used to be. In addition a resent Canon patent application shows using 3 transistors for 2 cells whereas the previous sensor cell had two transistors per sensor. Other advancements in semiconductors (borrowed from DRAMs) allow a cell to retains its high 'full well capacity' even as the footprint of the cell is reduced. Then outside the sensor, there has been progress in lower noise amplifiers and A/Ds. Do you have a patent number and a site where I could download a copy of the patent application. TIA jpc |
#37
|
|||
|
|||
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Noise ?? | Noname | Digital Photography | 13 | August 12th 04 10:37 PM |
Noise Ninja | Michael M. Cohen | Digital Photography | 3 | July 8th 04 02:14 AM |
D70 noise? | Petter Nilsen | Digital Photography | 3 | June 26th 04 09:44 PM |
New camera with LOW CCD noise required | scott | Digital Photography | 15 | June 26th 04 01:48 AM |