Hallo,
please with information if someone help me, today I tested the 17-40L and 70-200 2.8i 0.24 to 70 2.8 II IS,I found that changing the aperture the noise too loud on these lenses .. Canon 17-40L and 17-50 2.8 sigma.I checked C100 and fine aperture is set,II and 70-200 2.8L IS and 24-70 2.8 II diaphragm works perfectly and do not hear any noise when changed.Canon 17-55 2.8...canon 24-105L 4.0 and Canon 15-85 IS anyone tested these lenses?
this noise to be heard on the lens aperture?


Thanks

Yes, there is noise. Why is that a problem for you exactly?

Sorry they are photographic lenses they where never designed for video, they all make some degree of noise. They aren't de-clicked either so changing iris won't look smooth. This isn't a train smash.