IRIS steps at DVinfo.net

Frederic Segard · September 18th, 2005, 06:44 PM

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.

Chris Hurd · September 19th, 2005, 01:12 AM

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.

James Emory · September 19th, 2005, 03:22 AM

I noticed that the wheel is back on the H1 instead of the lever on the XL-2. That's good.

Jacques Mersereau · September 19th, 2005, 07:10 AM

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.

James Emory · September 19th, 2005, 07:14 AM

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?

Jacques Mersereau · September 19th, 2005, 07:31 AM

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.

Chris Hurd · September 19th, 2005, 08:20 AM

Sorry but it is not an analog ring. It's a wheel with a discrete number of contacts.

Jacques Mersereau · September 19th, 2005, 08:24 AM

Hey Chris,

So it's the same as the XL1 and you see the iris changes
with each click?

Chris Hurd · September 19th, 2005, 08:36 AM

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.

A. J. deLange · September 19th, 2005, 09:30 AM

0.2 stops per step as opposed to quarter stop steps (assuming they are uniformly spaced).

Boyd Ostroff · September 19th, 2005, 11:56 AM

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.

September 18th, 2005, 06:44 PM	#1
Frederic Segard Major Player Join Date: Jul 2003 Location: Montreal, Canada Posts: 209	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.

September 19th, 2005, 01:12 AM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	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. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

September 19th, 2005, 07:10 AM	#4
Jacques Mersereau Trustee Join Date: Mar 2002 Location: Ann Arbor, MI Posts: 1,334	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. __________________ Jacques Mersereau University of Michigan-Video Studio Manager

September 19th, 2005, 07:31 AM	#6
Jacques Mersereau Trustee Join Date: Mar 2002 Location: Ann Arbor, MI Posts: 1,334	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. __________________ Jacques Mersereau University of Michigan-Video Studio Manager

September 19th, 2005, 08:20 AM	#7
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Sorry but it is not an analog ring. It's a wheel with a discrete number of contacts. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

September 19th, 2005, 03:22 AM	#3
James Emory Regular Crew Join Date: Aug 2002 Location: Atlanta, Georgia Posts: 1,892	I noticed that the wheel is back on the H1 instead of the lever on the XL-2. That's good.

September 19th, 2005, 07:14 AM	#5
James Emory Regular Crew Join Date: Aug 2002 Location: Atlanta, Georgia Posts: 1,892	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?

September 19th, 2005, 08:24 AM	#8
Jacques Mersereau Trustee Join Date: Mar 2002 Location: Ann Arbor, MI Posts: 1,334	Hey Chris, So it's the same as the XL1 and you see the iris changes with each click? __________________ Jacques Mersereau University of Michigan-Video Studio Manager

September 19th, 2005, 08:36 AM	#9
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	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. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

September 19th, 2005, 09:30 AM	#10
A. J. deLange Major Player Join Date: Jun 2004 Location: McLean, VA United States Posts: 749	0.2 stops per step as opposed to quarter stop steps (assuming they are uniformly spaced).

September 19th, 2005, 11:56 AM	#11
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,802	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.