It's a ploy by Canon to extract the most amount of money possible out of its customers:
First, the 24-70L f/2.8 USM II, because the v1 has a known user base, and the II is an obvious upgrade path for v1 users.
Then, the 24-70L f/4.0 IS USM, because some of the II users need IS, compactness, and light weight more than f/2.8.
Then, the 24-70L f/2.8 IS USM, as the new top end lens in this focal range. People who bought the above two lenses who want the strengths of both will buy this lens. Expect this lens to be announced in a few months, after the f/4 IS lens sales start to drop off.
And then finally, the 24-70L f/4.0 USM, for people who can't afford any of the above but still want a quality lens in this focal range. Like the f/2.8 IS USM, it will be announced after sales of the f/4.0 IS USM drop off so as not to cannibalize any sales.
Canon is quite the crafty company!
First, the 24-70L f/2.8 USM II, because the v1 has a known user base, and the II is an obvious upgrade path for v1 users.
Then, the 24-70L f/4.0 IS USM, because some of the II users need IS, compactness, and light weight more than f/2.8.
Then, the 24-70L f/2.8 IS USM, as the new top end lens in this focal range. People who bought the above two lenses who want the strengths of both will buy this lens. Expect this lens to be announced in a few months, after the f/4 IS lens sales start to drop off.
And then finally, the 24-70L f/4.0 USM, for people who can't afford any of the above but still want a quality lens in this focal range. Like the f/2.8 IS USM, it will be announced after sales of the f/4.0 IS USM drop off so as not to cannibalize any sales.
Canon is quite the crafty company!
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