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| G7 E-Shutter You can see there are different types of light source here. Sun at the top, then something with a magenta color next down. The mid level looks a bit green maybe due to the color on the walls. There is a yellow color cast at the bottom. This shot used 1/100 second, but others in the series used intermediate speeds such as 1/80 and 1/125 with no sign of banding on any of them. I have no idea what type of technology the interior lights use. |
The G7 is a MILC with a mechanical focal plane shutter which can cause loss of sharpness with some lenses at some focal lengths at some shutter speeds.
The Electronic Shutter prevents blurring but brings other problems. One of these is banding under fluorescent and possibly other light sources such as LED.
The Owners Manual has this brief and not very helpful note on Page 179:
“When the electronic shutter is used under fluorescent or LED lighting, etc., horizontal
stripes may appear on the picture. In such cases, lowering the shutter speed may
reduce the effect of the horizontal stripes.”
There is no explanation about the reason for the “stripes” or any explanation of the connection between shutter speed and the “stripes” or any information about the technology of the E-Shutter at all.
I think this represents disgraceful dereliction of Panasonic’s duty to communicate with its customers who are after all the reason for its continuing existence.
I tested the G7 under fluorescent light using standard Australian 50hz alternating current power supply. I used shutter speeds from 1/8 to 1/800 second in 1/3 EV step increments.
I repeated the test under the LED lights which happen to be in my study.
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| E-Shutter 1/50 sec. 1/25 and 1/100 sec look the same |
Findings
I found no banding with the LED lights. Presumably some other type of LED light could cause banding but I have no knowledge of any details about this.
Under fluorescent light I found:
* At 1/25 second or slower there was no sign of banding. (the slowest available shutter speed is 1 second at low ISO settings, 1/8 second at high ISO settings)
* At 1/50 and 1/100 second there was no sign of banding, but there was banding at the intermediate speeds, 1/30 (very faint), 1/40, 1/60, 1/80.
* At 1/125 and faster there was banding at all speeds, becoming more prominent at higher speeds.
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| G7 E-Shutter 1/125 sec. Faster speeds show more obvious banding. |
Practical Implications
When using the E-Shutter in situations where it appears there is or may be a problematic light source the appropriate action appears to be either
a) Make some test shots and inspect for any sign of banding when reviewing on the monitor.
b) Turn the Mode Dial to S and select 1/25, 1/50 or 1/100 second (may be different in countries running AC at different hz) depending on requirements to manage camera shake.
I have done quite a lot of indoor photography under a range of mixed lighting sources and not had a banding problem unless I went looking for it as for the tests reported here.
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