Image Stabalisation ... a very valuable tool for nature/macro/landscape/travel photography, not useful for astronomy I'd expect.
I can shoot 1/15th second shots at 400mm with my partners canon 100-400 F4-5.6 L IS, but can only shoot down to about 1/60th at 200mm with my 70-200 F4 L non-IS. It makes a huge difference.
Roger.
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