Here's a good review of the Coastal Optics 60. It's widely considered a reference lens.http://diglloyd.com/articles/CoastalOptics60f4/index.htmlAs suggested - the Coastal Optics 60 is just as much (or more) of an exotic and more complex a design than the 400 f/2.8 or 600 f/4. Put in that context, $4650 really is not that expensive if you need the quality and performance the lens delivers.Eric BowlesNikonians TeamMy GalleryWorkshopsNikonians membership — my most important photographic investment, after the camera
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