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i have a big problem and need your help, i have BMCC 2.5k EF, got set of menual EF lenses but now i need to use on my BMCC B4 mount Fujinon TV-broadcast zoom lense x2 extender, i got the cheapest adapter from EF to b4 but my picture is darker then never and quality is shitty ... gonna work on F/4 stop with 800 ASA and the pic is too dark ... for some reason i can't open aparture more then F4 stop because anything lower than f4 looks like garbage. ... i need something better quality adapter to not lose the quality of picture and light incoming into the sensor, im looking for EF to B4 adapter to use B4 mount lense sorry for bad English :) i tryed my best to explain my problem thanks ! oh yea, if u can suggest me any camera for sitcom broadcast better then BMCC with same price or higher a little bit $1.5k or 2k also if u know is there BMCC with b4 stock mount ? because i can't found it on there website or on bhpjotovideo Thanks !