Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Reply
 
Thread Tools Search this Thread
Old Aug 4, 2008, 9:52 AM   #1
Junior Member
 
Join Date: Jul 2008
Posts: 14
Default

Dear, I have questions about "Effective Pixel, Sensor photo detector & Pixel density", are they all talking about the SENSOR in the camera?

Is it the low Pixel Density the better sensor it is?

Which of the following has Better Sensor? Thanks for any advice!!!

The Nikon D3 has
Effective pixels 12.1 million
Sensor photo detectors 12.9 million
Sensor size 36 x 24 mm (8.64 cm²)
Pixel density 1.4 MP/cm²

The Nikon D700 has
Effective pixels 12.1 million
Sensor photo detectors 12.9 million
Sensor size 36 x 24 mm (8.64 cm²)
Pixel density 1.4 MP/cm²

The Canon 5D has
Effective pixels 12.7 million
Sensor photo detectors 13.3 million
Sensor size 36 x 24 mm (8.64 cm²)
Pixel density 1.5 MP/cm²

The Canon 1Ds Mark3
Effective pixels 21.1 million
Sensor photo detectors 21.9 million
Sensor size 36 x 24 mm (8.64 cm²)
Pixel density 2.4 MP/cm²
mak15 is offline   Reply With Quote
Sponsored Links
Old Aug 4, 2008, 10:16 AM   #2
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,543
Default

Higher Pixel Density means higher resolution.

Lower Pixel Density means lower potential for noise.
TCav is offline   Reply With Quote
Old Aug 4, 2008, 10:48 AM   #3
Junior Member
 
Join Date: Jul 2008
Posts: 14
Default

Sorry, I don't understand what you meant.

The Canon Powershot A590 has
Effective pixels 8.0 million
Sensor photo detectors 8.2 million
Sensor size 1/2.5 " (5.75 x 4.31 mm, 0.24 cm²)
Pixel density 32 MP/cm²

It's Pixel density is 32 MP/cm², is that means it has higher resolution than the others?
mak15 is offline   Reply With Quote
Old Aug 4, 2008, 11:02 AM   #4
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,543
Default

The four image sensors you referred to were all the same size, therefore, a higher pixel density would mean a higher resolution.

The Canon Powershot A590 has a higher pixel density, but a much smaller image sensor.

When you squeeze more pixels into the same area, you increase the resolution and pixel density. When you reduce the size of the image sensor, you increase the pixel density but not the resolution.
TCav is offline   Reply With Quote
Old Aug 4, 2008, 12:08 PM   #5
Super Moderator
 
peripatetic's Avatar
 
Join Date: Nov 2004
Posts: 3,599
Default

But it does go to show that you could produce a 270Mp FF sensor if you gave it the same pixel density as the A590!

Of course it would probably be diffraction limited at f2.8?? (wild guess) And noisy as heck. Still - makes you think eh?
peripatetic is offline   Reply With Quote
Old Aug 4, 2008, 12:13 PM   #6
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,543
Default

peripatetic wrote:
Quote:
But it does go to show that you could produce a 270Mp FF sensor if you gave it the same pixel density as the A590!
Yes, but you'd need something like USB 6.0 to get it onto to your PC. [suB]:-)[/suB]


TCav is offline   Reply With Quote
Old Aug 4, 2008, 2:04 PM   #7
Senior Member
 
BillDrew's Avatar
 
Join Date: Jun 2002
Location: Hay River Township, WI
Posts: 2,512
Default

peripatetic wrote:
Quote:
...
Of course it would probably be diffraction limited at f2.8?? (wild guess) And noisy as heck. Still - makes you think eh?
Why would the pixel density have anything to do with diffration limit? Isn't that determined entirely by the the physical size of the aperature (not the f/number)?
BillDrew is offline   Reply With Quote
Old Aug 4, 2008, 8:28 PM   #8
Junior Member
 
Join Date: Jul 2008
Posts: 14
Default

Thank you so much, guys!
mak15 is offline   Reply With Quote
Old Aug 5, 2008, 1:58 AM   #9
Super Moderator
 
peripatetic's Avatar
 
Join Date: Nov 2004
Posts: 3,599
Default

BillDrew wrote:
Quote:
peripatetic wrote:
Quote:
...
Of course it would probably be diffraction limited at f2.8?? (wild guess) And noisy as heck. Still - makes you think eh?
Why would the pixel density have anything to do with diffration limit? Isn't that determined entirely by the the physical size of the aperature (not the f/number)?
http://luminous-landscape.com/tutori...solution.shtml
peripatetic is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 12:25 PM.