Del goes "full frame." Canon 5D MK "original"
I think the EFS lens f value is measured across a (35mm) full frame. cut the sensor size in half and you are only getting 1/2 of the light the full frame would pass, so your F stop goes up 2X. I think that is about right even if I didnt get the ratio correct (50% crop would double F-stop?) Going from f2.0 to f1.4 on my Tak is barely any stop petal visible to none. I have an old screw mount Vivitar 2X teleconvertor that doubles the f-stop of the lens its attached to, its on a little scale on the side.
I think the EFS lens f value is measured across a (35mm) full frame. cut the sensor size in half and you are only getting 1/2 of the light the full frame would pass, so your F stop goes up 2X. I think that is about right even if I didnt get the ratio correct (50% crop would double F-stop?) Going from f2.0 to f1.4 on my Tak is barely any stop petal visible to none. I have an old screw mount Vivitar 2X teleconvertor that doubles the f-stop of the lens its attached to, its on a little scale on the side.
