> I wondered about the EF300mm f4.0 L IS USM (1190g), but it's a bit
> expensive and inflexible.
The drawback is the length. Bit long for most situations where you
need to move around.
> Unfortunately the EF70-200 f2.8 L IS USM weighs a whopping 1570g.
> Add on a 2x tele and that's 1835g! The 100-400 was 1380g, and that
> seemed too heavy to use as a walk-around lens to me.
So use a 600L, then the 70-200 will be a nice lightweight break ;) Or
a 80-200 2.8L.
> I'm seriously considering getting just a 1.4x for now, as it's likely
> to be useful in the future too. I could also save up for an EF 200mm
> f/2.8L II USM + 2x (total 1030g) for when I don't need to zoom out.
Never get fit with that one.

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