"Stepless" aperture iris on 14-140 kit lens

E

emory

Active member
With the camera's mode dial set to "S" and the dedicated motion picture button pressed, the aperture is adjusted steplessly and noiselessly during pans from light to dark areas. The trouble is, in the "S" mode the ISO is on AUTO -- that is, often way too high and noisy.

With the camera's mode dial set to "creative motion picture mode" and the motion picture mode menu set to EXPOSURE MODE "S", the ISO can be selected manually, but during filming the aperture is adjusted in distinct steps, accompanied by an audible clicking of the iris. In short, it is unuseable.

Is there something wrong with my kits lens or have any of you noticed this on yours as well?

After all, the "stepless" iris was touted as one of the key features of the kit lens...
 
I was able to select the ISO manually to 1250 in "S" mode in the regular "camera" mode and it recorded video with stepless aperture changes when going from light to dark areas.

Randy
 
Thanks for testing this, Randy. Every time I press the dedicated motion picture button, the ISO I set (say, 100 ISO) turns to AUTO and judging from the visible noise in the EVF image, the ISO's been pumped up to very high levels.

Maybe I have to change other menu items. I'm new at this, so I'm not sure which ones.

If you get a chance, could you check if the following applies to your camera as well:

With the camera's mode dial set to "creative motion picture mode" and the motion picture mode menu set to EXPOSURE MODE "S", the ISO can be selected manually, but during filming the aperture is adjusted in distinct steps, accompanied by an audible clicking of the iris.

Thanks again.
 
You seem now to have discovered a key thing - video on the GH1 is in full auto mode at all times unless you use "creative motion picture" mode.

As for stepless aperture - well, there's a difference in behaviour when you are preparing to record, eg before you press the button, and when actually recording. But changes in aperture can still be more abrupt than you might be lead to believe. At the end of the day the only way to get full control of what happens is to use full manual mode.
 
Thanks for your input, Gentlemen.

I suppose for serious filming, manual is the only way to go -- including focus, as I've noticed occasional "pumping" on autofocus. Still, for quick undpredictable action (following toddlers, for instance), I guess the AUTO mode is better than nothing.
 
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