#1. "RE: Nikon Nikkor 50mm f2 Lens with D40" In response to Reply # 0 Fri 03-Jun-11 03:05 AM by aolander
That's the way it is supposed to be. The aperture stays wide open, but closes down to the set aperture when the shutter is released. (Stop the lens down a bit, look into the lens, and release the shutter; you'll see the aperture close down.) You'll have to use manual exposure mode and check the histogram to get the exposure right, i.e. no metering with this lens.