Anyone use Swarovski spotters for Bird shots?


EOS 5D Mark IV
Aug 8, 2011
A Guy I work with is into Bird Photography. Since we are all challenged by distances, he mentioned that if I was willing to go manual, that this might be an option:

It might be a bit pricey, but if it can do decent 1700mm equivalent shots, might be worth the price.

Anyone used this sort of non-standard set-up? What are the results like.