Recently I unearthed my (original version?) Metabones Speed Booster. For those not familiar, this adapter is a revolutionary idea that takes full frame lenses and reduces the magnification and image circle to match smaller sensor sizes. They also have the added benefit of increasing the effective aperture. In my case I'm taking Canon EF mount lenses and using them on my Sony e-mount mirrorless cameras. So one amazing feature of digital photography is the ability of software to correct lens defects. In fact profiles either built in or custom made exist for many lenses that correct for geometric distortion (pincushion or barrel distortion), chromatic aberration and vignetting. I rely on those corrections now. And it occurred to me, how do profiles work when using the "Speed Booster"? There's glass in there, clearly there's going to be some different defects than the primary lens on its own. Does the profile for the primary lens apply at all when using the "
Discussion about cameras, lenses and photography in general.