It features a 2.5-inch 230,000-dot resolution LCD monitor, CCD sensor with ISO 200-1600 (3200 Hi-1) and 3D Color Matrix Metering.

[4] In March 2007, Nikon released a sister model, the D40x, which included a 10.2-megapixel sensor and several other changes over the original D40.

[5] Reviews of the Nikon D40 have been generally favorable due to its ergonomics and image quality.

[6] It received some criticism for some design compromises Nikon undertook to keep the D40's price and size competitive.

[5] While identical in external design to the D40, it has a 10.2-megapixel CCD sensor, continuous shooting up to 3 frames per second, and a base sensitivity of ISO 100.