The base of the camera houses the battery compartment (as previously described), the product label and a metal tripod mount aligned with the center of the lens and focal plane.
The D40 has an electronic-release pop-up flash which will either raise automatically (in Auto or one of the Scene modes depending on the flash mode) or manually by pressing the flash button. This button also doubles as the flash mode and flash compensation button, by holding it and turning the main or sub command dial. The flash has a guide number of 17 (m at ISO 200) and raises approximately 50 mm above the top of the lens.
Flash Hot-shoe / external flash
The D40 has a standard (ISO 518) accessory shoe which is compatible with third party flash systems for flash sync and more advanced i-TTL with the SB-400, SB-800, SB-600 or SB-R200. Non-TTL Auto available with the 80DX, 28DX, 28, 27, 23, 22s and 29s. The new compact (optional) SB-400 external Speedlight has a guide number of 30 (m at ISO 200), supports i-TTL, manual exposure, rear-curtain sync and red-eye reduction. The SB-400 has a tilting flash head which locks straight ahead and has click points at 60, 75 and 90 degrees.
Lens Mount / Sensor
Below on the left you can see the D40's lens mount with the mirror down, on the right with mirror up and shutter open (exposing the sensor).
Lenses are inserted twisted clockwise and lock in place with an anticlockwise
turn. This is a standard Nikon F lens mount but without the mechanical focus drive pin meaning you can only auto-focus using AF-S or AF-I lenses (see the first page of this review for more detail).
Shutter Release Sound
In some of our digital SLR reviews we now provide a sound recording of a continuous burst of shots to provide a sample of the shutter release sound. The SD card used was a Lexar 133x 1 GB. The D40 has a surprisingly well damped, quiet shutter release with short viewfinder blackout.
JPEG Fine continuous, 30 seconds
Nikon D80 JPEG Fine - 77 frames (2.55 fps continuous)