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We've been thinking about a doubler for Patty's Cannon 250 zoom. We could have really used it when she took pictures of the Swans.

I picked this up before I left Salt Lake. It is a great lens, but not the best for low light since it is "slow," aperture is pretty small.

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Olympus M.Zuiko 75-300mm f/4.8-6.7 ED Digital Zoom Lens

The crop factor is 2, so it is actually a 150-600mm.