Philipbloom has published a new review on the Metabones Speed Booster Adapter. Yes, this is the adapter that is supposed to make your lens wider, faster and sharper! And here’s the review that delves into details of this adapter. (A small hint – he likes this adapter!). There are lots of experimental sample shots in this article to test this theory.
So how does it increase the speed of the lens?
“By the same way that a telephoto adapter decreases it. The ‘Speed Booster’ is placed behind the lens, so the entrance pupil of the lens (the aperture you can see when you look through the front of any lens) remains the same, but the focal length is reduced as it compresses the image, so the speed increases. (I think!) The amount of light that would have covered a full-frame sensor is now focused onto the smaller M4/3 sensor and is therefore more “concentrated”. There is a maximum input aperture of f/1.26 and a maximum output of f/0.90.”
The reviewer also has some sample shots taken using Sony NEX-5N mounted with Canon 70-200mm f2.8 lens. Apparently, this test worked out quite well!
Check this review out!