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Vancouver47 wrote:
I suspect a 600 DO will only be shorter and only slightly lighter because of the size of the f/4.0 elements. Shorter will make it easier than the 600II to hand hold, but I doubt as much as we all hope.
Yes, a strong reduction in weight is only possible with different construction that doesn't need the large glass front elements, which constitute an increasing percentage of the total weight with longer/brighter lenses. So in longer DO lenses it is more about easier handholding and transportation (airline limits etc.) than about lower weight.
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