I have just bought one these attachment for my Canon EF 400mm f5.6L. It is a lightweight device for converting the lens to a 40x angled spotting scope and it works brilliantly, giving good crisp bright images virtually no CA like many "proper" scopes. Off course I have no eyepiece zoom facility and it is not waterproof but nor is the lens, however it can be mounted on a zoom lens as well. The best thing is that it only cost me £39 from SRS Ebay shop, comes in a protection case so now I don't need to carry a scope and a telephoto lens! Magnification is 1/10 x the focal length value of the lens. Available for Nikon lenses as well.
Details here:
http://www.ebay.co.uk/itm/KENKO-LENS2SCOPE-CONVERTS-NIKON-LENS-INTO-SPOTTING-SCOPE-NEW-UK-STOCK-/360903354348?pt=UK_Photography_Conversion_Lenses&hash=item54078427ecDavid
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