Iris exposure

[Don Greening]

Make sure the “magic” button is not active (full auto). Also as you’ve mentioned, make sure the auto iris slider switch is in manual mode. That one is on the lens itself. It’s probably best to use manual focus as well so the camera doesn’t try to refocus an anything else like your arm in the middle of your shot. In order to do this, in addition to putting the focus switch to manual is to pull the focus ring back until into straight mechanical focus mode. This disengages the focus ring from the motor drive.

No need to apologize for asking your questions. This is why these forums exist. The only silly questions are the ones you don’t ask.

– Don

Don Greening
A Vancouver Video Production Company
Reeltime Videoworks
http://www.reeltimevideoworks.com

[Roger Bansemer]

Thanks again…
I’m familiar with the manual/auto focus so I’m OK with that.
I have the iris set to manual.
I have the “auto mode” set to “full auto mode set to OFF”
and I am still getting a change in exposure when I something of a light color goes into frame.
I’m still missing something.
The “shutter” just below the lens is set to ON.
Roger

Roger Bansemer – PaintingAndTravel.com

[Don Greening]

There shouldn’t be any change in exposure if everything is set to manual. One way to tell for sure is to activate the brightness percentage in the middle of the viewfinder. The button for that is near the top of the camera close to the handle on the left side. It’s the middle of 3 buttons (BRT DISP). When you slide a lighter object into the camera’s field of view (slowly) there shouldn’t be any difference in the percentage of brightness until the object enters the little brightness display square in the centre of the VF. If there’s something that’s still causing the camera to auto adjust the iris then the percentage should climb as soon as the object enters the frame.

Also keep an eye on the iris ring. if it moves for any reason without you moving it yourself then there’s something not quite right. The camera cannot auto adjust the brightness without the iris ring rotating.

– Don

Don Greening
A Vancouver Video Production Company
Reeltime Videoworks
http://www.reeltimevideoworks.com

[Ronnie Martin]

Make sure that white balance is not on Auto. I was shooting an automobile race one evening and did not realize the white balance was on auto. There was a flagstand that would come into view every time the cars came around the track and it was bright white. As a result, the color temperature would change on every lap.

Good Luck

Ronnie

Ronnie Martin
Kato Video Productions
ronnievideo@aol.com

[John Sharaf]

Same for “Auto Knee”, sometimes it can make picture look like exposure change without iris moving. Set to “Manual” in menu.

JS

[John Street]

Make sure your shutter is not on “auto” … either set it to “off” or your desired shutter speed … but if it’s in auto then it will cause brightness changes just like auto-iris does.

—
John Street
http://www.inpoint.tv
Mac OS 10.7.5, FCS 7.0.3, QT 7.6.6, Mac Pro 2x3GHz Quad-Core, 16GB Ram

[Roger Bansemer]

I was away for a while but wanted to thank everyone for their replies. I’m going to give all those helpful hints a try this morning.
Roger
https://www.paintingandtravel.com

Roger Bansemer – PaintingAndTravel.com

[Marine Bmth]

Hello,

I’m having exactly the same problem with my EX3 : the iris is still changing and moving automatically while the iris button is switched on “Manu” and the full focus mode is OFF.

It doesn’t make sense! Did you find any solution ? ??

[John Street]

Are you sure all the “auto” functions are turned off? Specifically, auto-gain and auto-shutter …

—
John Street
http://www.inpoint.tv
Mac OS 10.7.5, FCS 7.0.3, QT 7.6.6, Mac Pro 2x3GHz Quad-Core, 16GB Ram