70-200mm f/4L vs. 70-300mm f/4-5.6 IS

Started Jan 26, 2006 | Discussions thread
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netspots Senior Member • Posts: 1,761
70-200mm f/4L vs. 70-300mm f/4-5.6 IS

My son is only 3 years old (he's my primary Subject), but it won't be long before I'll want something with a longer reach. So...

70-200mm f/4L vs. 70-300mm f/4-5.6 IS

I don't think I'd ever feel comfortable with a big white lens -- but for argument sake, how do these lenses compare in:

1 - AF speed?
2 - Sharpness?
3 - Color / Contrast?

Also, how much difference does the IS feature on the 70-300 really make?

Thanks in advance.

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