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Hi Peter,
Try this. If you have a zoom lens, use one eye to focus the camera on some object and compare the size of the object with th other eye. Adjust the zoom until the two images coincide. The value of the focal length on the lens will be the 1:1 value. If that comes at 50mm, then 200mm will certainly give mags. of 4x. I do have a little concern about the interpretation of the markings on a lens, (whether the multiplying factor has been incorporated or not) but maybe we won't go into that until we have the results of your test.
Robert
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