| Year | 1981 |
| Lens Groups | 5 |
| Lens Element | 6 |
| Aperature Blades | 9 |
| Minimum Aperture | f/32 |
| Closest Focusing | 8 m |
| Max. Magnifcation | 1:12.7 (0.079x) |
| Filter Size | 48 mm |
| Diameter x Length | 155 x 462 |
| Weight | 3750 gr (8.27 lb) |
| Hood | - |
| Beefiness | 0.43 |
I sold a 600 and 800 copy to a film production company. A year later they are selling one of them and they chose to keep the 600. I personally kept an 800 copy myself for the absolute best in far detail resolving power. That said I find when shooting little critters in my backyard they often venture closer to me than I can focus and I miss the 600. More info on these two lenses can be found in this set on my flickr photostream: http://www.flickr.com/photos/ontarian/sets/72157623884845990/