Canon 70-200 2.8L or 100-400 5.6L ?
For my newly purchased 7d I want to buy a telephoto lens preferable a rather bright one.
The 70-200 is brighter but the 100-400 has the same aperture at 400mm (70mm). The latter has a larger zoom range and can even be used as a small 70mm telesope (fit a 1.25" diagonal on the rear end to allow an eyepiece).
I want to use the lens for both astrophotography and 'regular' photography for both moving and still objects.
What are your ideas ?
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