Light metering

[comte de Mazan]

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Hello,

I have a question about this camera.
How does it handle focusing and light metering at wide apertures, since these are M lenses which lack this feature?
Does the sensor automatically compensate even if the lens aperture is closed?

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[jaapv]

Sorry, I do not understand the question.  
A sensor cannot compensate, it can only measure the amount of light. (for fellow nerds: disregarding some tricks like dual base ISO)
What feature do M lenses lack? They have an aperture and focus ring. 

The M-EV1 will work like any other M camera. It will measure the amount light, the user will set the exposure by adjusting aperture and shutter speed, or you can use the A setting and adjust the aperture to your taste on the lens and the camera will control the exposure by adjusting the shutter speed. That is all.

Then you have an ISO setting which will handle the amount of light measured by the sensor (AKA exposure) in the further digital processing in the camera, which will influence the (automatic) shutter speed setting and EVF brightness. 

The EVF will have a digital controller which will handle the brightness  or simulate the exposure with or without ISO amplification added, user choice.

Focus, well, you turn the ring and judge the focus in the viewfinder. 

[comte de Mazan]

Thank you for your reply, but I thought I had been clear in my question...
What I mean is: On an SLR camera, focusing and light metering are done at the widest aperture (with modern lenses). You close the lens aperture to adjust the light, and the viewfinder remains set to the widest aperture. It will close when the shutter is released, once the mirror flips up.
The Leica M-EV1 is a mirrorless camera, meaning it's an SLR camera without a mirror; the viewfinder image is viewed through the lens. My question was, how come the viewfinder image doesn't darken when closing the aperture (since the lens doesn't remain at its widest aperture)?

[jaapv]

Not so on an M. It is not an SLR as it is no reflex camera , nor is any other mirrorless camera.  the EVF can be switched to darken/lighten with exposure or keep its brightness. It is all done by electrons. Amplification of the signal is the key word. 

[SrMi]

3 hours ago, comte de Mazan said:

Thank you for your reply, but I thought I had been clear in my question...
What I mean is: On an SLR camera, focusing and light metering are done at the widest aperture (with modern lenses). You close the lens aperture to adjust the light, and the viewfinder remains set to the widest aperture. It will close when the shutter is released, once the mirror flips up.
The Leica M-EV1 is a mirrorless camera, meaning it's an SLR camera without a mirror; the viewfinder image is viewed through the lens. My question was, how come the viewfinder image doesn't darken when closing the aperture (since the lens doesn't remain at its widest aperture)?

With SLRs that focus wide open, regardless of the set aperture value, the camera computes the necessary values (ISO and shutter speed) via simulation. The same goes for mirrorless cameras (sometimes focusing and metering work with closed or partially closed apertures). Leica M cameras do not need to simulate light reduction and can use the light intensity directly to compute the necessary values.

Metering in M-EV1 is the same as in M11. M-EV1 is not an SLR. If you keep ISO and shutter speed constant and have exposure simulation enabled, the EVF will darken when you close the aperture.

[Jon D]

1 hour ago, SrMi said:

With SLRs that focus wide open, regardless of the set aperture value, the camera computes the necessary values (ISO and shutter speed) via simulation. The same goes for mirrorless cameras (sometimes focusing and metering work with closed or partially closed apertures). Leica M cameras do not need to simulate light reduction and can use the light intensity directly to compute the necessary values.

Metering in M-EV1 is the same as in M11. M-EV1 is not an SLR. If you keep ISO and shutter speed constant and have exposure simulation enabled, the EVF will darken when you close the aperture.

I did not know that. As a slight aside, do you know how the Q3 handles it?

[SrMi]

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49 minutes ago, Jon D said:

I did not know that. As a slight aside, do you know how the Q3 handles it?

All Q cameras meter wide open, using simulation to adjust EVF brightness and compute the settings for the selected shooting mode.