In article <4a9nlt$cvp@tst.hk.super.net>, hudsonch@news.hk.super.net says...
>
>Ribnitz Robert (ribnitz@sun.com) wrote:
>: Well, first of all: Speed...
>: Secondly: Optical Quality..
>: BTW: 70-300/4-5.6 means 5.6 at the 300mm end..
>
>Just one more point: lens with fixed focal length are lighter and more
>compact than comparable zooms - less chance of getting a "shaken" >picture, ESP if the shutter speed is lower than 1/60 sec.

If the shutter speed is the same with both the smaller and lighter
lens and the longer and heavier lens, it is likely there would be
LESS bad effect from shaking with the longer and heavier lens (more
mass X more length = slower motion [or something like that.....]).
My 80-200 f2.8 (at 200mm) is MUCH easier (ahem, for short periods!)
to hand-hold successfully at 1/60-1/125 than my small 200mm f4 fixed
lens, for instance.
Hope this helps.