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#1
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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
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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 |
#3
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Sensor resolution, any sites with actual measurements?
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)? -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330 and E500 forum at http://groups.yahoo.com/group/MyOlympus/ Olympus E500 resource - http://myolympus.org/E500/ |
#4
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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
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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 |
#6
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Sensor resolution, any sites with actual measurements?
In article ,
says... "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'. Maybe Rich is not a native English speaker. -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330 and E500 forum at http://groups.yahoo.com/group/MyOlympus/ Olympus E500 resource - http://myolympus.org/E500/ |
#8
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Sensor resolution, any sites with actual measurements?
In article , Alfred Molon
writes In article , says... "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'. Maybe Rich is not a native English speaker. Unlikely, his English isn't that good! ;-) -- Kennedy Yes, Socrates himself is particularly missed; A lovely little thinker, but a bugger when he's ****ed. Python Philosophers (replace 'nospam' with 'kennedym' when replying) |
#9
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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
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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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