Why no afordable 400f/4?

Started Feb 9, 2013 | Questions thread
R2D2 Forum Pro • Posts: 17,013
How about a 500mm f/5.6L IS?

I'm thinking that a 500mm f/5.6L IS would be less expensive and lighter than a 400mm f/4L IS.  I'd go for one of those. 


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