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Canon 40D Live View Artefact
So while testing my new field flattener today (more on that later), I ran across this interesting behaviour. I was shooting using live view to manually focus, and with very fast shutter speeds.
The attached were shot at 1/5000 second. One was with live view active, and one was normal shutter by deactivating live view before exposing.
I can only assume it is due to the way the shutter closes, and the fact that it is still exposing one end of the sensor while the other is covered. As a normal shutter setting would expose in an open/closed wiping pattern, and live view exposes in a half wipe, it isn't tough to figure out the source of the problem. I found it was visible from around 1/1600 of a second on up. I guess flat frames could partially compensate for it.
Notice how one side is over exposed, and the other under?
Has anyone else run across this?
Eric
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