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Oh wow! Now that is a cool shot.
Though I must admit I'm a little suspect of his claims. A nikon DSLR attached to that scope would only give a magnification of around 40X. I'd like to see the original image uncropped to judge the field of view.
According to my calculations (assuming the nikon has a similar chip size to the canon) the field of view should be 38.5 X 58.5 arc min with a resolution of 1.14 arcsec/pixel. If the IIS is 80 m long and orbits at an average of 350 Km then its angular size in arcsecs as viewed from earth is only 47 arcsec. This means in his original image the ISS would have only been 41 pixels long. A standard high res Canon image is 3072 X 2048 pixels. With an uncropped image and the knowing the objects size and distance from us then the imaged resolution can be worked out and finally the telescope f/ratio and focal length.
If you can get the full imaging details I'd love to know how he did it.
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