Nikon D40 is an entry-level single lens digital reflex camera. The product is ideally suited for photographers who wish to graduate from the advanced ‘point and shoot’ digital camera level to digital SLR. Compared to other dSLRs, D40 is smaller in size and lighter in weight. The CNet review indicates that D40 is a typical budget dSLR, which provides basic features. The resolution level of six mega pixels is on the lower side. The camera supports ISO levels from 200 to 1600 and additionally a HI 1 level which is nearly equal to an ISO 3200 range. The review gives high scores for photo quality. The noise levels and lens distortion are low. The picture colors are good and pleasing. D40 is equipped with many components recycled from old models. This may be a cautious effort to keep the price low. The navigation provided is easier to operate for snap-shot camera users.

The Consumer Reports review highlights that D40 is favorably priced when compared to other entry level dSLRs. D40 offers the flexibility to use interchangeable lenses and a manual operation option for shutter and aperture settings. The camera also supports eight preset modes for selecting the control parameters automatically. The LCD in the camera displays a sample image when the preset mode options are selected. The camera also provides an editing tool for on-camera editing of the picture. The edited image is stored as a different file, thus preserving the original unedited image. The review indicates that the D40 is comfortable to use up to ISO 800. The Neo Camera review indicates that D40 is quite fast and responsive. The image quality is considered below average by this review, with over saturated colors. With adequate lens, sharp pictures can be produced. But D40 does not provide support to the prime lenses. D40 is favorably priced and will be an attractive camera for people who wish to make an entry into creative photography with digital SLRs.