You are not allowed to use flash in, Churches (during weddings, kids christening etc.) , hospitals, theaters, circus, zoos, museums, some indoors sports, concerts. Sure you may not shoot in those "few" situations, but it is up to the OP to decide it right? So I just gave an example where for me the sensor output could be compared and depreciating this has no value at all...You make a fair point, I suppose.Sure there is not enough light. But there is not enough light for both cameras right? So you can see how both cameras behave in similar conditions. Often you are not allowed to use flash. So the question is not whether or not flash or other source of light will improve certain picture (in day light where you can use base ISO even point and shoot cameras performs reasonably well) , but how two sensors performs in similar conditions. and those are real life conditions. Search the discussion it was quite long, but I have kept the pictures on my PC and was able to share them right away.Both of those muddy images are just awful because there was not enough light. They would have been improved immensely with skilful use of a flashgun or two. They are not good examples, to my eye, and represent everything that is wrong with 'available light' and the concomitant emphasis on so-called high ISO performance. That needs to be said as well in the context of informed decision.... I bought D5100 as for me IQ is the main selling point. Sure for the OP priorities could be different, but now he/she has a two real life pictures to compare and take informed decision...
However, shooting when there is not enough light and one does not have or cannot use flash then I say that is not real life photography and not what one should base a camera choice upon (except for filling up the recycle bin) unless that kind of situation is what is going to form the majority of ones shooting scenarios. We all have different style of course - but I still think for a beginner the D90 represents an excellent, economic starting point.
Forgot to mention that the RAW files from the D90 sensors and Sony sensor that could be found in D7000/D5100 are different. I just like the RAW files of D7000/D5100 much more and if the OP is going to experiment in post processing as well, he/she will see noticeable difference.
N.B. I am not mentioning D3300 as I have no real live experience with it..
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