According to the rumors surfaced over the web New version of EF 400MM F5.6L IS Lens will be going to announced on 2016, In the upcoming version of 400mm F5.6L IS Lens the weight will be reduced, optics will be improved and price will be bit high compared to the older version of 400MM F5.6L Lens.
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I’m a working class citizen that loves photography! Unfortunately can’t afford the prices on these big lens, that I so desire.