I think you are talking about another lens. The EF28-300 f/3.5-5.6L IS USM weighs 3.7 lbs and costs about $1600. (heavier and more expensive than the 100-400)
the EF 100-400 f/4.5-5.6L IS USM weighs 3.1 lbs and costs about $1200.
According to the reviews I have read, they seem very comparable, but since I have only used the 28-300 I need input from a user of both lenses.
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