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Sensor resolution, any sites with actual measurements?



 
 
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  #1  
Old March 5th 06, 09:46 AM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?

I'm not talking about sites like dpreview.com that might be testing
sensors with less
than perfect lenses that happen to be used with some cameras. What I
mean are sites that have done tests with lenses that resolve (clearly)
beyond the sensor's capability.
No Canon 5D shots with wide open WA lenses, or related horrors.
I'm curious about how (for e.g.) the resolution of a FF camera compares
to cameras with smaller sensors, to see what effect pixel size (as
opposed to pixel count) has on absolute resolution, if any. I know its
not possible to avoid in camera processing which varies from brand to
brand,
but you have to start somewhere.
My preconception (correct by Mr. Roger Clark) was that pixel counts
determine absolute
resolution. The more pixels you can use to image something, the more
detail you will see.
But this seems to vary due to a lot of other factors.
-Pixel count
-Pixel size
-lens quality
-in-camera conversion and processing
-in-camera sharpening
-post camera processing
Even the image (it's characteristics) will effect different sensors
differently.

  #2  
Old March 5th 06, 10:38 AM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?


"Rich" wrote:
I'm not talking about sites like dpreview.com that might be testing
sensors with less
than perfect lenses that happen to be used with some cameras. What I
mean are sites that have done tests with lenses that resolve (clearly)
beyond the sensor's capability.


The dpreview test chart images are all taken with decent lenses at sensible
f stops.

David J. Littleboy
Tokyo, Japan


  #4  
Old March 5th 06, 12:17 PM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?


"Rich" wrote in message
oups.com...
Even the image (it's characteristics) will effect different sensors


Still spelling its with an apostrophe I see.

And it's 'affect', not 'effect'.


  #5  
Old March 5th 06, 02:09 PM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?

In article ,
Alfred Molon wrote:
In article .com,
says...

No Canon 5D shots with wide open WA lenses, or related horrors.


Speaking about this, are there lenses for full-frame DSLRs with corner-
to-corner sharpness even wide open (and also at wide angle, why not)?


'Wide open' is a rather useless requirement. It is quite possible that an
f/1.4 lens set to f/4 is sharper than an f/4 lens wide open. But the f/4
lens is likely to be sharper wide open than the f/1.4 lens.

If you look at MTF graphs, wide angle lenses simply don't have great
corner sharpness. You want high-end telephoto lenses for that (or stop
down far enough).


--
That was it. Done. The faulty Monk was turned out into the desert where it
could believe what it liked, including the idea that it had been hard done
by. It was allowed to keep its horse, since horses were so cheap to make.
-- Douglas Adams in Dirk Gently's Holistic Detective Agency
  #9  
Old March 5th 06, 04:02 PM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?

In article ,
Alfred Molon wrote:
In article coh.net,
says...

'Wide open' is a rather useless requirement.


Well no, you might have to use the lens at the widest aperture because
there is not sufficient light.


If you have enough light to use a f/2.8 lens wide open, then you have
enough light to use an f/1.4 at f/2.8 as well. Or you have to compare
the f/1.4 wide open with the f/2.8 at a two stops higher ISO or a two stops
slower shutter speed.

If you look at MTF graphs, wide angle lenses simply don't have great
corner sharpness. You want high-end telephoto lenses for that (or stop
down far enough).


Why can't they design WA lenses with corner to corner sharpness (even
wide open)?


It is probably physics that gets in the way. But you have to define 'corner
to corner sharpness'. Does that refer to an MTF curve that approaches a
straight horizontal line (ignoring the actual MTF value) or does it mean a
specific minimum MTF in the corners for a given resolution?


--
That was it. Done. The faulty Monk was turned out into the desert where it
could believe what it liked, including the idea that it had been hard done
by. It was allowed to keep its horse, since horses were so cheap to make.
-- Douglas Adams in Dirk Gently's Holistic Detective Agency
  #10  
Old March 5th 06, 06:30 PM posted to rec.photo.digital
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Default Sensor resolution, any sites with actual measurements?


"Alfred Molon" wrote in message
...
Still spelling its with an apostrophe I see.

And it's 'affect', not 'effect'.


Maybe Rich is not a native English speaker.
--

No excuse (but he is anyway).
He's been told how to spell 'its' before.



 




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