$1100 difference with rebate

Started Apr 16, 2013 | Questions thread
AllOtherNamesTaken Veteran Member • Posts: 3,563
Re: A couple things...

David Hull wrote:

Right... that's why it says f4.0 on the spec sheet.

That lens is actually has the light transmission of a F4.5, even though it is advertised as F4.0 - doesn't matter what number they choose to put on it, it behaves as a f4.5 (T-Stop).  There is plenty of information over on the Canon forums regarding this.  It loses a lot of light compared to just about any other lens.

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