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Hi,
No, I dont believe so. Rather than think of it as a magnification factor think of it as a crop factor. For example if you took a shot of the moon through say a EOS 5D with a full frame sensor and your EOS 450 D with an APS C size sensor using your 85mm F1.8 then the image formed on both chips of the moon would be the same size. There would be less sky around the photo taken with the 450 D though.
The FL in both cases and F number would be the same. This is because the lens is focussing the light on the sensor in exactly the same way with exactly the same strength; it's just that one sensor has less area.
That's my take on it anyway.
Cheers
Paul
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