Question about proper exposure with a manual lens

The camera's actual metering system is totally bypassed in Live View because the mirror is up and no light gets into the top of the camera. the metering system lives around the pentprism at the top. The camera "meters" during Live View by trying to examine what it sees on the sensor itself and making a best guess. it's not really metering the light, it's reading the signal strength of the sensor pixels.

Basically, Live View is not for photography, it's for video. You can use it in photography for critical focus, by switching to Live View, zooming it in and focusing, but then you should switch out of Live View and use the camera as a reflex camera so all of its systems are in play. Also, keep in mind that a Live View image does not represent the exposure the camera will actually make. While in Live View, the camera plays with the gain as needed to present a usable picture on the LCD screen. If you have it set for 30 second at f:2 and you're outdoors on a sunny day, you're going to get an all-white blown-out image for your photograph, but the Live View will show you a scene you can see. Similarly, if you set it to 1/500 at f:16 at night on the beach, Live View will show you a scene you can look at, but the camera will produce a black, seemingly unexposed image.

Live View is a television, not a viewfinder. Don't use it for a viewfinder.
 
The camera's actual metering system is totally bypassed in Live View because the mirror is up and no light gets into the top of the camera. the metering system lives around the pentprism at the top. The camera "meters" during Live View by trying to examine what it sees on the sensor itself and making a best guess. it's not really metering the light, it's reading the signal strength of the sensor pixels.

Basically, Live View is not for photography, it's for video. You can use it in photography for critical focus, by switching to Live View, zooming it in and focusing, but then you should switch out of Live View and use the camera as a reflex camera so all of its systems are in play. Also, keep in mind that a Live View image does not represent the exposure the camera will actually make. While in Live View, the camera plays with the gain as needed to present a usable picture on the LCD screen. If you have it set for 30 second at f:2 and you're outdoors on a sunny day, you're going to get an all-white blown-out image for your photograph, but the Live View will show you a scene you can see. Similarly, if you set it to 1/500 at f:16 at night on the beach, Live View will show you a scene you can look at, but the camera will produce a black, seemingly unexposed image.

Live View is a television, not a viewfinder. Don't use it for a viewfinder.

Awesome. Thanks very much for this post. Really helpful.
 

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