For Nikon, the D5000 series of cameras is a way to have multiple entry-level DSLRs to suit all budgets. Rather than upgrading a model and discontinuing the last one, Nikon keeps roughly three D5000-series models going at the same time.
High-resolution sensor with no optical low-pass filter gives good image quality; Quick autofocus system; Great colour rendition
Lacks control buttons; No built-in GPS module