GM5 & L.100 question

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kodachromed Junior Member • Posts: 28
GM5 & L.100 question

The base ISO on my GM5 is 200 but I can enable the extended ISO L.100 in the menu. I use this in bright light when I want to keep using the mechanical shutter which only goes to 1/500.

I notice Panasonic isn't alone in making the extended ISO something you have to enable. So it made me wonder if there is some kind of penalty, for example to DR, when you use the extended ISO.  If the base ISO is 200 then what is the camera actually doing when you enable the extended ISO?

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pannumon Veteran Member • Posts: 3,119
Re: GM5 & L.100 question

kodachromed wrote:

The base ISO on my GM5 is 200 but I can enable the extended ISO L.100 in the menu. I use this in bright light when I want to keep using the mechanical shutter which only goes to 1/500.

I notice Panasonic isn't alone in making the extended ISO something you have to enable. So it made me wonder if there is some kind of penalty, for example to DR, when you use the extended ISO. If the base ISO is 200 then what is the camera actually doing when you enable the extended ISO?

A short answer for the time being:

This has been argued quite a bit in the past, and my conclusion from that is that there are not much benefits (compared to ISO 200), but not much penalties, either. My understanding is that it mainly gives some flexibility with the shutter speeds.

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jhunna Senior Member • Posts: 1,598
Re: GM5 & L.100 question
1

kodachromed wrote:

The base ISO on my GM5 is 200 but I can enable the extended ISO L.100 in the menu. I use this in bright light when I want to keep using the mechanical shutter which only goes to 1/500.

I notice Panasonic isn't alone in making the extended ISO something you have to enable. So it made me wonder if there is some kind of penalty, for example to DR, when you use the extended ISO. If the base ISO is 200 then what is the camera actually doing when you enable the extended ISO?

If its like the GX-8 then it may actually be the true base iso.  I know I prefer the look of iso 100 on the GX-8 so I leave it there, or put it into Auto ISO.

I would take pictures at both iso's and compare, and ignore the extended designation if you like the results at iso 100.

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Barry Twycross Veteran Member • Posts: 3,490
Re: GM5 & L.100 question
1

kodachromed wrote:

The base ISO on my GM5 is 200 but I can enable the extended ISO L.100 in the menu. I use this in bright light when I want to keep using the mechanical shutter which only goes to 1/500.

I notice Panasonic isn't alone in making the extended ISO something you have to enable. So it made me wonder if there is some kind of penalty, for example to DR, when you use the extended ISO. If the base ISO is 200 then what is the camera actually doing when you enable the extended ISO?

When you enable L.100, you expose by +1ev over ISO 200. If you're shooting jpeg, the brightness is reduced to compensate. The penalty is you're more likely to get blown highlights.

If you're shooting raw, and careful about highlights, and are prepared to fix the exposure in post, L.100 could give you a better result.

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Chris Noble
Chris Noble Veteran Member • Posts: 3,566
Extended ISO

kodachromed wrote:

The base ISO on my GM5 is 200 but I can enable the extended ISO L.100 in the menu. I use this in bright light when I want to keep using the mechanical shutter which only goes to 1/500.

I notice Panasonic isn't alone in making the extended ISO something you have to enable. So it made me wonder if there is some kind of penalty, for example to DR, when you use the extended ISO. If the base ISO is 200 then what is the camera actually doing when you enable the extended ISO?

Extended ISO settings are digitally boosted (at the top) or attenuated (at the bottom). There is a slight SNR penalty, which is why you have to enable them. SNR purists avoid them.

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