bobn2
Forum Pro
In the end, what matters is the number of photons represented per unit area in the final print. This really depends on sensor size not the pixel pitch. The effects of different size pixels cancel out when you sample to whatever is the required resolution for the final image. On the other hand, if you've a certain maximum print size in mind, enough pixels is enough. at 200dpi final print, 12 MPix will give something like 50cm prints, and a good FF sensor gives decent noise performance for that size print.Because there is always a trade off. More MP's means smaller pixelsHow would it hurt you to get more MP in a camera that still offers
better DR and NR along with weather sealing, micro lens adjustment,
dust cleaning system, faster fps, etc. than existing 5D?
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MaxFX
which, all things being equal, requires more amplification for the
same signal level because the pixels can't collect as much light. If
you apply the same technology and design to a 16 MP FF and a 12 MP FF
the 12 should have lower noise and better DR because of the larger
pixel size. Many seem to be perfectly happy with 12 or 13 MP in a FF
camera as evidenced by the success and incredible images coming from
5D's and D3's.
Yes, that is the main disadvantage of high pixel count sensors.More MP's also means larger memory cards and more storage needs and
again, all things being equal, smaller buffers and slower shooting
rates. New technology does not always solve the problem of
diminishing returns.
About the same at equal magnification, a bit worse per pixel. Interestingly, Canon sensor technology doesn't appear to have progressed since the 20D if you look at the efficiency measurements here http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.htmlVirtually every test I've read shows that the
10MP 40D has slightly more noise than the 8 MP 30D.
I think you're right, the D3 sensor is the best you can get for efficiency, but it's only about 15% better than the Canons, which is a fraction of a stop. This seems to be about the limit with a silicon Bayer sensor.IMO sensor
design has hit a wall that will not come down until some new
revolutionary technology pushes high MP's with lower noise and better
DR to another level.
Just like the Ds's, so long as you keep the print size to the same as you would for the 5D, the IQ will be the same, or hopefully (with a newer generation sensor) a bit better. However, you'll get the option of big prints if you can stand the noise (you will spend more on memory, though).I know that I'm spitting in the wind here as Canon will undoutably
increase the MP's on the 5D replacement. I just hope they don't
sacrifice too much on the IQ side in doing so.
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Bob