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Hi Bojan, I like to keep things simple. So I put the Sigma DC 18-200mm lens on the Canon 20Da and set it at 200mm FL and see a set FOV; then I put the old Tokina 200mm lens onto the 20Da and then the FOV has been reduced by almost 50%. So to my understanding the Tokina is magnifying the image more than the Sigma lens and this result can be equated to an increase in FL.
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