That's because they are VDSLR lenses and therefore made so you can pull the aperture as well as the focus.
I don't speak about the aperture-ring, of course they have one. I just speak about composing the picture at the full open aperture, but the aperture is closing automatically on taking the shot. This is controlled electronically with a chip in the lens.
And they're not all VDSLR-Lenses, mostly exist two variants... for exaple one for still cameras (35mm f1.4) and the video one (35mm t1.5)
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