New answers tagged wide-angle
The Metabones Speed Booster will give you > 90% of the original aperture, while shrinking the image on the focal plane. That increases the apeture size (lower f number) when using it to mount a full-frame lens on a APS-C body. Some models support APS-C lenses, which would have the normal issues of any wide adaptor namely how well does the lens pick up ...
It depends on how the wide angle adapter is designed, most will reduce the maximum aperture of the lens, so you probably wont gain anything with this approach. It's worth noting that there will likely be a substantial loss in image quality when shooting through an adapter at f/1.4.
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