Jan said:
Edwin Herdman said:
It's worth mentioning that the T2i preproduction model scored about 50 points higher on DxOMark for ISO than the production model. That said this does sound promising, especially if the difference is visible (we don't have access to the DxO RAWs so it's taking them on faith that the preproduction T2i had better ISO).
Why does this sound promising, when a preproduction model is better than a production model?
I missed a comma in there. It should say:
"That said, this does sound promising, especially [...]"
By the way: I don't understand how the points are calculated. When you look at the SNR 18% chart, comparing 550D pp and 550D you can clearly see that there is absolutely no difference.
Not sure what you mean. When you look at the SNR 18% chart for the T2i, look at both cameras' ISO 12800 points - for the T2i preproduction they measured 9531 in actuality, for a SNR of 19.4 dB; the measured ISO of the production model has a value of ISO 10,222 for the same point, for a slightly lower SNR of 19.1 dB. At the low end of the ISO scale the situation is reversed.
Additional: For an explanation how they come to their ISO sensitivity rankings, look
here.