Nikon started removing optical low-pass filters on pro DSLRs, where owners are more likely to notice the extra detail, but that emphasis on super-sharp photos has been moving rapidly downrange. Today, its reaching the entry level through the new D3300. Although the camera shoots at the same 24 megapixels as its predecessor, its filter-free sensor should produce crisper-looking pictures without pushing would-be buyers to costlier models.