Paul_100A
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 p.1 #11 · Help with my exposure compensation settings | |
ruthenium wrote:
This isn't clear to me: "My camera is set so that the front dial adjusts the shutter speed and ISO".
Go to 1. Operations --> Dial Settings --> Dial Function --> A
There must be a single(!) function assigned to the front dial, e.g Exposure compensation. You cannot have two functions operating simultaneously.
The behavior that you described "the shutter speed that will be adjusted accordingly...until my min shutter speed setting of 1/320 is reached. At that point, if I continue to spin that..." sounds consistent with the function that you change by rotation the dial being Exposure Compensation.
Indeed, when the ISO is Auto (this is an important condition, see below), then the SS is maintained at the set minimum, e.g. 1/320s, when the Exposure compensation is negative. In this case the ISO is reduced, and the image gets darker. When the Exposure compensation is increased (positive), you shall see the ISO increase until the set upper limit, then the SS is reduced if the Exposure compensation is increased further.
If the ISO is not in Auto, then, the camera keeps it unchanged. Then, changing Exposure compensation shall always change the SS.
You are right about the behavior being somewhat complicated. I actually like what the camera is doing in Aperture Priority with Auto ISO when the Exposure compensation is used. That is, I like it that the camera keeps the exposure constant (meaning unchanged SS and aperture), while varying the gain (ISO) as much as this is feasible.
I expect that you know that the exposure on the sensor is controlled exclusively by the two parameters: SS and aperture. The ISO doesn't directly influence the exposure. Exposure seems to be often misunderstood....Show more →
--"My camera is set so that the front dial adjusts the shutter speed and ISO"
"You cannot have two functions operating simultaneously."
Correct. I cannot and I do not. Not simultaneously.
--"When I spin the front dial to compensate for light changes, it's the shutter speed that will be adjusted accordingly...until my min shutter speed setting of 1/320 is reached. At that point, if I continue to spin that same front dial the ISO is then adjusted since I've told the camera that I do not want to use a shutter speed lower than 1/320."
First the shutter and then the ISO. The sequence is then reversed when spinning the dial in the opposite direction. First the ISO then the shutter.
The way my camera is configured, according to the automated functions I have enabled with their limits selected and programmed, thus, how the camera operates and therefor controls the dial function.
When I spin the front dial the shutter value is adjusted until my pre-set minimum 1/320 shutter value is reached. Continuing to spin the very same dial then adjusts the ISO value.
*1/320 is my low (min) shutter value setting. *ISO 200 is my low ISO limit setting.
scene is metered at 1/640 and *ISO 200. spinning the dial to make the image darker will adjust the shutter value up. the front dial adjusts the Sv.
scene is metered at 1/640 (above my min Sv limit of 1/320. there is room for the camera to move the Sv) and *ISO 200. spinning the same front dial to make the image brighter will first adjust the shutter value down to the *1/320 limit and then adjust the ISO value up. the same dial adjusts the Sv and then the ISO value but not at the same time of course.
one dial does control both the shutter value and the ISO value though.
I'm not talking about metering where the camera, as you say, will try to maintain Av/Sv. I am talking about spinning the dial.
Exposure, yes, the amount of light and the amount of time the light has to reach the sensor/film. Film ISO chemical reaction to light, digital ISO is gain or amplification or something or other.
Yes, I have a basic, or perhaps even flawed, understanding of the science but that's only because I'm not very interested in the science.
I understand that exposure is set using Sv and Av and ISO is applied to those settings.
Folks whom poopoo Auto ISO don't understand that I think. They choose their Av/Sv settings poorly and then blame Auto ISO for what happens next.
With m4/3, when Av and Sv are at their limits, it's better to adjust the ISO to get the image 'to the right looking brightness' (what I simply and wrongly call exposure) instead of leaving the image 'too dark looking' (under-exposing) and correcting in post.
True story...when I shot (for years and years) in M mode, the process of how I changed the exposure was in the exact same order as what A mode with Auto ISO with min S/S does.
I usually shoot wide open so rarely touched the Av. To compensate for changing light levels I'd first adjust the Sv until I was no longer comfortable with adjusting the Sv any further. Then I'd adjust the ISO. Then I reversed the sequence and do so on and so on all day long spinning dials, pressing buttons, changing settings back and forth all day like a real camera operator. The automated way provides me the exact same results with a much simpler time, and more enjoyable time, in the field.
Turn on camera and adjust only one dial as required. Easy.
Edited on Mar 16, 2026 at 01:12 PM · View previous versions
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