On 29 Oct 1998 05:26:46 GMT, sachse@msc.cornell.edu (Wolfgang Sachse) wrote:

> What are the differences between the 20/f2.8D and 20/f2.8 AIS ?
> Why is the latter much more expensive? Is it worth it?

Nothing but construction...
Machined metal costs more than molded plastic...
I think so...;-)