Hi dear Ariana,

I'm surprise to see you here !!! :)

I just have a D50 and I'm so happy with. I buy it with lens 18 -55mm  and it's this lens I use more.
You can see this difference between both in here .You have this page  or here too where you can see some difference with other cameras

The bad critic for this D40 is

• slow kit lens;
• occasionally slow to focus;
• only 6 megapixels;
• raw editing software costs extra;
• control scheme can be awkward;
• no automatic sensor cleaning.