Iris Button not working ?

Hello been loving the BMC 2.5k and i recently bought a 10-22 mm canon lens and the Iris button once held wont work but dose for all my other lens .. is the lens faulty?

Hello been loving the BMC 2.5k and i recently bought a 10-22 mm canon lens and the Iris button once held wont work but dose for all my other lens .. is the lens faulty?

That lens may not be fully supported yet. See:
viewtopic.php?f=2&t=4651

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sorry to ask that, but I didn't wanted to create a new topic and couldn't find the answer elsewhere...

What does the Iris-button do on my BMCC MFT anyway? I read somewhere it's supposed to turn the Zebras on and off, but that doesn't work. The manual is silent about this, too.