Don't really understand your questions, but let me try to answer anyway.
From what I know, the D90 does correct for chromatic aberrations (purple fringing), and I do think it has better noise control over the D3000. So the D90 would give better quality photos in that sense.
But then again, there are many other factors to consider, like are you as likely to bring the heavier camera out to shoot as the lighter one? Maybe you can use the price difference to invest in things like an external flash?
For me, I'm just doing photography as a hobby, the image quality of a dSLR is way better than that of the compact camera I used, so I'm happy with a D3000. I do not make a living out of taking photos, they just go up on facebook for my friends to see.
Hi Timolo,
My question is using different DSLR camera body (like D3000, D90, D300 or D5000) plug in into a very good len. The output of the photo quality,sharpness,clearness,color..etc will given different right? My opinion it would be different.
Yes, you are right, if just for hoby and use for travel.. D3000 / D5000 is good choice. If go into intermediate or really in deep.. D90 or D300S is better!

