At 06:36 25.1.2001 -0600, you wrote:
>
>
>> So it is not an ED lens afterall.
>Alan,
>There's not much need for a lens that only goes to 90mm to use ED glass,
>which is used for the aberration correction in long telephotos. Lack of ED
>glass is no indication of low quality in this case.
>
>--Mike
I thought that Anomalous dispersion glass can help a lot in extreme wide
angles, too? You would perhaps use not low dispersion, but extra strong
dispersion, but the results are same - improved chromatic abberance?
At least the 2.8 ultra-wide zooms from C and N both AFAIK use such glass.
Frantisek
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