David Rasberry
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It is very difficult indeed to get broad zoom range and high speed in a compact lens that has to cover S35 or larger sensors.
I have sitting on the shelf an old Angenieux T1.8 18-180mm zoom built for 70's vintage 1" Plumbicon cameras, a bit smaller format than S35. The front element diameter is 6 inches and the lens weighs 21 lbs. Compact, lightweight, fast and wide range are mutually exclusive for S35 or larger formats. The Red 18-85 at T2.9 is about as reasonable a compromise as you will likely find. For some uses a 2/3"/16mm sized format is the superior choice.
I have sitting on the shelf an old Angenieux T1.8 18-180mm zoom built for 70's vintage 1" Plumbicon cameras, a bit smaller format than S35. The front element diameter is 6 inches and the lens weighs 21 lbs. Compact, lightweight, fast and wide range are mutually exclusive for S35 or larger formats. The Red 18-85 at T2.9 is about as reasonable a compromise as you will likely find. For some uses a 2/3"/16mm sized format is the superior choice.