bushwacker wrote:
the comment that says like \"50Ds sensor sensor outresolves Canon primes\" is this true? can someone please explain the theory behind this... [ sorry I\'m trying to understand this ]
I\'ll give you an example with scanning a printed photo to illustrate the theory:
Suppose that you print an 8\"x10\" photo at resolution 300ppi (pixels per inch) and then you decide to scan it.
The printed photo has a fixed resolution of 7.2mp (8x300x10x300).
If you use a 300ppi scanner, you will recreate the printed photo 1:1 (that is, 100%).
But what happens if you decide to scan it at 600ppi resolution?
With 600ppi, each pixel from the original photo will be represented with 4 pixels in the scanned image.
That is, you are getting a 4x magnified (digitally) version of the original photo.
But this magnified version does not contain more detail than the 7.2mp original photo - even though it\'s 28.8mp in size.
Same with lenses.
Lenses have a limited resolution, so once a sensor outresolves a lens, the image created by the sensor is simply a magnified version of the image projected by the lens.
The problem with the 15mpx on the 50D is actually not the sensor but the current Canon lens lineup.
If all Canon lenses (~60 of them) were sharp enough, there would be no problem with 15+ megapixels on 1.6x crop sensors (not counting the ISO/noise issues).
The thing is, out of the ~60 Canon lenses, maybe only 2-3 that do not cost $4,000+ can match the resolution of the 50D.
So, until Canon change their entire lens lineup, it is safe to say that the 50D outresolves most of Canon\'s lenses.
bushwacker wrote:
the comment that says like \"50Ds sensor sensor outresolves Canon primes\" is this true? can someone please explain the theory behind this... [ sorry I\'m trying to understand this ]
I\'ll give you an example with scanning a printed photo to illustrate the theory:
Suppose that you print an 8\"x10\" photo at resolution 300ppi (pixels per inch) and then you decide to scan it.
The printed photo has a fixed resolution of 7.2mp (8x300x10x300).
If you use a 300ppi scanner, you will recreate the printed photo 1:1 (that is, 100%).
But what happens if you decide to scan it at 600ppi resolution?
With 600ppi, each pixel from the original photo will be represented with 4 pixels in the scanned image. That is, you are getting a 4x magnified (digitally) version of the original photo.
This magnified version does not contain more detail than the 7.2mp original photo - even though it\'s 28.8mp in size.
Same with lenses.
Lenses have a limited resolution, so once a sensor outresolves a lens, the image created by the sensor is simply a magnified version of the image projected by the lens.
The problem with the 15mpx on the 50D is actually not the sensor but the current Canon lens lineup.
If all Canon lenses (~60 of them) were sharp enough, there would be no problem with 15+ megapixels on 1.6x crop sensors (not counting the ISO/noise issues).
The thing is, out of the ~60 Canon lenses, maybe only 2-3 that do not cost $4,000+ can match the resolution of the 50D.
So, until Canon change their entire lens lineup, it is safe to say that the 50D outresolves most of Canon\'s lenses.
Nov 04, 2008 at 09:25 PM
Previous versions of George.ML's message #6348237 « DPreview of 50D is flawed ..please read »
