Issues (might be camera related):- the first frame at each zoom level is underexposed (looking at the script that might be the nd filter?)
- the camera refocuses and there is a slight delay when it moves to the next zoom levelA solution: is it possible to lock the autofocus at the start so it doesn't refocus throughout the zoom range? (which will solve the two issues)
Can a global ND filter be set at the beginning as well which doesn't change throughout the image sequence? this way on bright days a slower speed and open aperture can be selected in manual mode and reduce flicker in the resulting timelapse video.I suppose that wouldn't work if the ND filter is simply simulated by a closed down aperture but it's worth asking.
- the first frame at each zoom level is underexposed (looking at the script that might be the nd
I'm not sure I understand how using it to get slower speed and a wider aperture will reduce flicker in the final timelapse though.
The script does a refocus and resets the exposure after every zoom step on purpose. I think it has to do that or your shots will be out of focus and incorrectly exposed?
After experimenting with other intervalometers I discovered that I achieved the least amount of flickering/ most consistent exposure results across frames with the widest aperture and a shutter speed under 1/200. These settings can allow for shooting in bright days if there is a built in ND filter which can be set prior to shooting.
The focus is a bit trickier when you get beyond a certain value as your focus plane becomes thinner. But if you know what you want to focus on you can dial it in the camera (approximately) while in manual focus. This is something that will require more testing though. However most general scenes will call for focus at infinity and a small travel across the zoom.
e.g. settings could beLock focus at start [ ]Lock exposure/shutter speed & aperture at start [ ]Set ND filter level [ n ]Essentially more manual control would be a bit more work setting up initially but would produce better more consistent results.
I will test the current version and report.
From my many and long experiments with setting manual focus at infinity with CHDK, I'm not convinced that you can change the lens position (i.e. zoom) and have the focus point not change. If you were originally focussed at infinity then the depth of field for these little cameras might hide that.
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