HarryWintergreen said:I would go for a really well stabilized lens. Once you have become used to not worrying about shaky hands your focussing on the situation improves. an update of the 100-400 should sport a better IS.
Not to be a downer, but IS on lenses like that isn't incredibly useful. Don't get me wrong, I love it on the 100-400, but unless the image is around 1/1000 of a second your image isn't going to look that good because your subject is usually moving. The IS definitely helps, but a better IS wouldn't be nearly as beneficial on a lens like that as you might think.
Also, the new one might require a serious bank loan, whereas you can get the current one used for less than $1,500.
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