Popular Photography is reporting that the Nikon D40 isn't backward compatible with a most older Nikkor lenses.

During our current lab test (results to be published in the March 2007 issue and online in February 2007) we discovered that the D40 isn't fully backward compatible with most older Nikkor lenses! Sure, you can attach them to the D40, but autofocus won't work unless the lens is a relatively new, digital-only AF-S or ED-IF series. (These both differ from older Nikkors because they have the AF motor built in to the lens body).

If the D40 is going to be your first DSLR this doesn't really affect you but if you've got a bag full of older Nikon glass or would like the option of buying used Nikon glass this is a serious concern.

Tags: photography, nikon, nikon d40