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Osiris30
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match14 said:Osiris30 said:match14 said:Osiris30 said:So the T3 (Canon's lowest end DSLR) gets a brand new sensor (the MP count is different than the 450D as is the ISO performance)
The differance in ISO performace could be due to the XSi being digic 3 and the T3 being digic 4.
I'm sorry you think the difference of *two full* stops (and then some as the ISO 6400 looks better than 1600 ever did on my XSi) is due to a *processor*? Even on my PC there is no way for me to make an XSi image at 1600 look as decent as the samples of this at 6400 OOC. I'm pretty sure Adobe, Neat, etal are pretty good at NR. Certainly there is no hope in hell of me pushing an XSi to anywhere *near* 6400ISO, so no, it's not the Digic.
I think people *really* need to stop thinking the Digic processors are anything more than glorified calculators. They just add, subtract, multiply and shove data around.
Yes I do think that because digic processors are more than calculators they also contain software algorithms for processing raw data e.g. converstion from raw to jpeg in camera. Also amplifiction of the signal from the sensor for different ISO settings is handled by the digic processor, betteramplification algorithims, better noise performace. With each new version of digic comes revised software.
Obviously the change in processor alone is not the only thing to improve ISO performance but it surely plays a part.
Digic's don't contain "software algorithms". That is in the firmware. Ignoring for a minute that software doesn't live in hardware. Amplification is not handled by the Digic either, it's handled by the onboard pixel level signal amps. Digic are ARM core based (I believe) processors with SIMD functionality. Digic's are just basic logic cores to control the machine coupled with some simd/matrix multiplication support circuitry. I would *strongly* suggest you research what ASICs are, and the functionality they general contain before you make any more statements about what the Digic does or does not do.
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