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Someone redpill me on speedboosters.
As far as I'm concerned they let you save what would otherwise be a wasted outer region of a full-frame lens image by concentrating it into the space of a crop lens.
This all seems fine and dandy, you effectively get an extra stop of light and you get full use of the minimum focal-length of the full frame lens. Everyone wins.
What I don't understand is why these are only made as an intermediary adapter between different mounts. Eg, I'd like to make full use of my FF Sigma 16mm 1.4 on my a6000, but every single speed booster that exists serves to solely go between canon's full frame EF mount lenses to something else.
Am I missing some crucial understanding here about speedboosters or do people just not make what I am looking for?
Also, whats with the funny little foot/pedestal on all of them?
