| Year | - |
| Lens Groups | - |
| Lens Element | - |
| Aperature Blades | - |
| Minimum Aperture | - |
| Closest Focusing | - |
| Max. Magnifcation | - |
| Filter Size | - |
| Diameter x Length | - x - |
| Weight | |
| Hood | - |
| Beefiness | NAN |
Photos tagged for the Vivitar FD 21mm f/3.8 in the Canon Classics Flickr Group.