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Aperture vs IS canon lenses
Any thoughts on the Canon 24-70 f/2.8 L USM vs 24-105 f/4 L IS USM. Thinking about the options, f/4 with IS gives an additional 3 stops at lower shutter speeds, which equates to f/2.8 (I think). Is that a rational way of looking at the problem - f/2.8 with IS would be ideal.
I would like the aperture, but really like IS. Optically, these are good lenses as I understand it.
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