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Old 23rd November 2018
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Re: Lenses: relative length & diameter

My Panasonic 100-300mm f4-5.6 is 126mm long, has a 67mm filter thread and weighs just over 500g. That fits well into my camera bag inside its padded JJC case. The way I am thinking, that is a design over 6 years old, is a 3X zoom and a larger aperture range than what I am thinking of. It works very well in all departments.

That is what makes me wonder if Sigma (or someone similar) could design the 150-400mm f4.5-5.6 lens within the same dimensions - at least the length with the new tech available. It has less than 3X zoom.
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