G'Day Craig.
I have the older brother of your microscope. Mine only takes a 640 x 480 image ( and mine is touted as a 50x and 200x). In mine, the same mechanism controls both focus and magnification. It is therefore impossible most of the time to achieve the quoted magnification. I can only assume it is possible at some extreme focus condition, but I haven't proven it.
Under normal conditions, magnification will always be less than the quoted figure.
Al.
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