A list of lenses can be mount with Nikon BR-2A ( 52mm filter thread )
Guideline - Lens : Magnification Ratio
* Nikkor AF 20mm f2.8 : 3.4X
* Nikkor AF 24mm f2.8 : 2.5X
* Nikkor AF 28mm f2.8 : 2.0X
* Nikkor AF 35mm f2 : 1.4X
* Nikkor AF 50mm f1.4 : 1/1.1X
* Nikkor AF 50mm f1.8 : 1/2X
* Micro Nikkor AF 60mm f2.8 : 1/1.2X
Things you need to have :-
1 x Nikon D40x camera body ( any digital slr body also can - Nikon brand )
1 x Nikon BR-2A Adapter Ring
1 x Nikon 50mm f1.8 AF lens
Steps on attaching the lens to the body :
Gently apply this BR-2A adapter to the front mount of the 50mm f1.8. Nikon BR-2A are meant for 52mm filter thread. Doesn't require to be tighten as you will find difficulty to remove it.
It would be fully manual focus and you can choose not to focus it as the focusing ring would be in another way round. Aperture setting would be at the front part. Remember , your camera body setting must be with M mode.
If you choose F2.8 or F1.8 as your aperture, you can see some of bokeh around the subject.
Tadaaaa~~!! Here's the result captured by the lens with adapter :