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Flickering issue with some Canon lenses


Alessandro
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Since some time I'm noticing flickering issue in certain clip from my canon cameras (5d3 and 5d2.. booth in h264 and RAW); it happens even in sunlight so I can exclude light frequency issue.

It is noticeable most of all in highlights and It's easily visible even on camera display with ML zebras on, as you can see zebras pulsate. 

I suspected it could be caused by a slight variation of diaphragm aperture and after some tests I've discovered that that happens with camera set to "1/3 EV steps", only using intermediary apertures; so 2.8, 4, 5,6, 8, 11 are stable, while 3.2, 3.5, 4.5, 5.0 etc flikers. Setting the camera to "1/2 EV steps" all apertures work fine.

That happens both with 5d3 and 5d2, but only with two of my canon lenses: 24-70 2.8 II and 100mm 2.8 IS macro, while the old 24-70, 50 1.4, 16-35 2.8 mk1 and 70-200 IS 2.8 mk1 work fine.

Have you ever noticed that on your lenses?

Alessandro

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EOSHD Pro Color 5 for Sony cameras EOSHD Z LOG for Nikon CamerasEOSHD C-LOG and Film Profiles for All Canon DSLRs

I've solved the problem!!

It was caused by Magic Lantern "Exposure override" option se to ON.  I cannot understand why, but switching it on you can clearly see the iris, throw the front lens, slightly open and close.

Sorry to have create a new topic.... maybe it will help someone in the future

In any case I will post this on ML forum.

 

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