f stop and crop sensors

Started May 11, 2010 | Discussions thread
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mick92627
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f stop and crop sensors
May 11, 2010

Newbie question here. I have 2 Canon lenses, EF 24-105mm f/4L IS USM, and EF 35mm f/1.4L USM. Usually they are attached to my 5D Mk1.

I am getting a 7D today. I know it's a crop sensor with a 1.6x mag factor, so my lenses are really 38-168mm and 56mm.

My question is: does that effect the f/ number as well? I think it doesn't, but I want to be sure. So for the 2 lenses mentioned above, the f/ will remain f/4 and f/1.4 and widest aperture, correct?

Also, are there any other considerations I should be aware of in taking EF lenses and putting them on crop sensor (EF-S) bodies?

Thanks in advance for any and all who care to take a run at this.

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