Uploaded March 2018 | Updated September 2026, 3 days ago

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Will a B4 magic enable a 2/3" sensor camera to fully cover the full HD sensor?

I test my Canon 2/3" lens with a B4 Magic optical adapter that enlarges the circle of light produced by the lens to more fully cover the Micro 4/3 sensor, but it still vignettes visibly and, because you are shooting in HD (1080) there's not much cropping you can do.

See my other test with the 4K version on a GH4 to see the on-sensor crop and how that dramatically improves things for two reasons:

1: the crop reduces the vignette.
2: higher resolution means you can then crop into the video (in post) and have a usable 3K image.

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