by Philip Greenspun; created 1998
This is an expensive high-quality lens that focusses continuously down to 1:1 (i.e., you can take a picture of something that is 24x36mm in size, the dimensions of the standard 35mm frame). The lens has an ultrasonic motor that allows manual focusing even in AF mode. However, I found that the brand new lens I borrowed from my friend Rob was not able to reliably AF at all, even at normal distances of 10-12 feet. It worked great as a manual focus lens, though. The lens comes with a tripod collar and works with the 1.4X and 2X teleconverters.
|Construction:||14 elements, 12 groups|
|Closest focusing:||0.48m (1.5 ft)|
|Length:||186.6 mm (7-3/8 in.)|
|Weight:||1090 g (38.2 oz)|