50x1.5 = 75
200x1.5 = 300
Looks like you multiplied your numbers twice or multiplied instead of dividing!
If you want to calculate FOV, you multiply the focal length by 1.5 when going from APS-C to Full-Frame, and divide by 1.5 when going from Full-Frame to APS-C. Keep in mind that a 200mm lens is always a 200mm lens, however, and that the calculations above are only to show what focal length on a FF body would result in the same FOV on APS-C.
Adam
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