Slow news day. Check out this video on the Nikon lens scope converter:
Nikon no longer makes this product (you can still find some on eBay). Kenko has a similar solution that is available now for $180 at Adorama and B&H. Some third party options are available on Amazon.
See also this related NikonRumors blog post from 2011:
How to convert your Nikon lens into a telescope or a microscope (Nikon lens scope converter)
Via Nikkor Lenses Facebook Group
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