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Canon XL H Series HDV Camcorders
Canon XL H1S (with SDI), Canon XL H1A (without SDI). Also XL H1.


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Old September 18th, 2005, 07:44 PM   #1
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IRIS steps

I hope there are going to be more steps for iris control then the XL1s. Not sure about the XL2, but I find the stepping when opening and closing the iris quite annoying.
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Old September 19th, 2005, 02:12 AM   #2
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I can tell you it stops down to f/9.5 before closing completely. Whether more discrete steps have been added in between, I'm not sure.
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Old September 19th, 2005, 04:22 AM   #3
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I noticed that the wheel is back on the H1 instead of the lever on the XL-2. That's good.
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Old September 19th, 2005, 08:10 AM   #4
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One of the things we asked Canon to do was provide a smooth iris
tranistion. Obvious image changes caused by stepping are a
'prosumer' alert and hard to edit around.
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Old September 19th, 2005, 08:14 AM   #5
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Well, if it's anything like the XL-1/s, then it still has steps however subtle. Why can't it just be a free moving wheel, the way it should be?
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Old September 19th, 2005, 08:31 AM   #6
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That was requested along with HD-SDI. At least they got that right,
but I hope the wheel is like the ring on a pro rig.
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Old September 19th, 2005, 09:20 AM   #7
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Sorry but it is not an analog ring. It's a wheel with a discrete number of contacts.
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Old September 19th, 2005, 09:24 AM   #8
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Hey Chris,

So it's the same as the XL1 and you see the iris changes
with each click?
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Old September 19th, 2005, 09:36 AM   #9
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Yes that's right Jacques. If there's any improvement here, I'm thinking that it would be the same number of steps as before, but since the f/stop range is not as broad as before that means each step is more discrete (that is, smoother) than before.

26 steps from f/1.6 to f/9.5 is smoother than 26 steps from f/1.6 to f/16.
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Old September 19th, 2005, 10:30 AM   #10
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0.2 stops per step as opposed to quarter stop steps (assuming they are uniformly spaced).
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Old September 19th, 2005, 12:56 PM   #11
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In the Sony world the PD-150/VX-2000 had only 12 discrete clicks which resulted in very noticeable manual changes. With the PD-170 they doubled this to 24. I don't know how this works on the Z1, but the wheel turns smoothly with no discernable clicks and the transitions look completely smooth - huge improvement. Let's hope Canon did something similar.
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