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If I may quote a reliable source on this issue: one often reads this about the 1.6 crop factor effect, but the focal length of a lens does not change, whatever camera one uses with it. Therefore, the magnification or 'reach' remains the same.
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Matt it doesn't matter how you phrase it, magnification relative to the image ratio is real and the reach of your lenses on a FF sensor, as compared with a crop sensor, is less.
I have owned a 20D, 50D and now 5DII and I can assure you that the Tele lenses (and all lenses for that matter) have less reach on FF sensor.
To put it simply the image scale of a 200mm lens on a crop sensor will be 1.6x greater than that of the FF sensor; that is to get
the same image scale or FOV on a FF sensor you will need a lens of 320mm which
oddly enough equates to 1.6 x 200.
On the reverse side your wide angle lenses have much wider FOV's on a Full frame sensor although that's not really an issue as 10-22 etc lenses have approximately equivalent FOV to 17 on a FF sensor.
With Tele lenses however longer+quality=$$$$
Try pricing an L series 600mm.