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Old lens:



 

New lens:



It has gotten bigger and heavier, with 14 elements in 11 groups (was 11 elements in 9 groups), and with a "BR" element. Will be interesting to learn what that stands for.

 

actually, supposedly stands for blue spectrum refractive optics.   not sure how that is supposed to work, refraction in only the blue spectrum would hardly work for a lens. but something must be special about this lens regarding blue refraction properties.