Manuel Rodrigues

53mm should be 35mm off course...

Hi There, I have two questions on the Metabones speedbooster which I own. I can't find a manual on the metabones site so ill try my luck here. First question: according to this graphic: BMCC Matrix S-1.png The crop factor is 1.75 when using the BMD pocket cam with the Speedbooster and full frame lenses. As far as I know this means that ilI have to multiply the focal length of my lenses with 1.75 to get the actual focal length behaviour on my camera. So a 53 mm lens becomes a 61 mm lens. This is what happens in my experience. But Metabones states this in the same article: "For example, a 50mm f/1.2 becomes a 32mm f/0.80, and Sigma’s new 18-35mm f/1.8 will become an 11.5-22.5mm f/1.1." I find this confusing. They say that the focal length will become shorter and longer in the same article!? Link to the article: http://www.metabones.com/article/of/metabones-nikon-g-to-bmcc-bmpcc-speed-boosters-available-starting-today Next question: In the same article they say: "Nikon mount versions of both new Speed Boosters feature an improved version of Metabones’ unique manual G aperture adjustment mechanism, which has the same angular throw distance as earlier Nikon Ai/AiS lenses. This improved version features a linearized f-stop adjustment as a function of aperture ring adjustment angle. The mechanism is clickless in order to maximize its usefulness to cinematographers." What is this exactly and how does it work? Again, ive tried to find a manual but it is not available on the metabones site. Hope you can help! Thanks! Manuel