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"Forced flash" is when you force the flash to fire even if the camera thinks there's enough light to photograph without it.
As an example, consider taking a photo of a person outdoors with the sun coming from one side and casting half the face in shadow. By forcing the flash to fire, you can illuminate the shadowed portion without affecting the background.
If you see a shadow in the lower part of your image when shooting with the built-in flash, it's probably the shadow of your lens hood.
Try removing the lens hood. If that doesn't work, perhaps the lens is too long/big: consult your manual: the manual should tell you which lenses cause shadows. Otherwise, try using a shoe-mount flash or off-camera flash.
Overlaying pictures, like almost all photo manipulations, is better done on a computer using "real" software rather than on a camera. You get much more control on a computer. However, the D40 does have a wide repertoire of photo manipulation capabilities.
In order to overlay images, you must be shooting in RAW (or RAW+JPEG). Select Image Overlay from the Retouch menu. A preview dialog will be displayed with Image 1 highlighted. Press OK to get a photo selection dialog. Use left/right to highlight the first picture in the overlay. (You can press and hold the Zoom button to see the selected photo fullscreen.) Press OK to select the image. Optimize exposure for the image by pressing up/down. Press left/right to highlight Image 2. Select the second image the same way. Press left/right to highlight the Preview column. Overlay will show you the result, allowing you to go back and change things if you wish. Save will save the overlaid photo.
The shadow in the lower portion of your camera is probably caused by the lens hood. The solution is simple: remove the lens hood whenever you're using the built-in flash.
That is because of the flash .... its not a problem it comes naturally as the flash of the camera is located at the left side it creates a shadow on the right side .... try to click a photo keeping the camera in portrait position (i.e Vertical position) that should eliminate the shadow
Look carefully at your images taken with flash... on the horizontal image is the lower part of the image slighty darker and have a rounded fall off at the edges? Is the vertical image dark side a straight hard line or is there a rounding to the top and bottom?
What we are looking at is if you have a very wide angle lens with the lens shade attached to the lens, then the built-in flash catches part of the lens shade and make a shadow on your subject... take the lens shade off and try the same shot and see if that makes a difference...
The camera has a main mirror that you see with the lens off and a sub-mirror underneath the main one. It may be the sub-mirror is not flipping up completely when you take a picture. It could be off its hinges or damaged. Any good camera repairman in your area should be able to confirm this