F-stop is a scalar unit for measuring light intensity.
F2.8 means a certain light intensity and
F4.0 means a half the light intensity comparing to F2.8
How can F2.8 on a crop body be equal to F4 on a FF body
if you are using 50mm on a crop body, then the equivalent focal length of the lens to be used onto a FF body is 50x1.6 = 80mm.
It simply means that if there are 2 person standing side by side.
A is using 50mm on cropped body
B is using 80mm on FF body.
both are aiming on the same subject and both will eventually get the same composition / framing.
The key difference is that 80mm lens will produce better bokeh because focal length is greater.
nothing to do with full frame body or crop factor body.
moi ish de gotch post bepor huan program por calculatinkz DOF... the COF por cropz han FF ish de rittle bitz diff.... transpost prom Medium Format renz tu FF, shootinkz F2.8 from 3m distance, only eyelash clear... rest ob face blur...
the comment is not from me. it is comment from other CSers. i just paste over to here share some information only.
the guy who mention this also paste a link for reference
http://www.photozone.de/canon-eos/42...is_50d?start=1 (Scroll down to "bokeh@ 55mm".)
ya lor... bokeh tio si lidat nia... all those so called bokeh siaos discussing this topic think get top lens can shoot like our gwc king are dreaming... coz its ultimately not the equipment, but the person behind. U can have the best equipment and claim u r master but shoot like normal still again, u r just a guy who dont think and shoot.
allo, that's is just a person opinion.
pls dun over react
true or not we can combine gears and do the test
Billy bbbuttie... both standing side by side cannot have the same composition and frame... coz FF and Crop FOV ish different mah... to have the same, crop shooter have to stand further back in relation to 80mm & 50mm different...so the focal length DOF will have variations and DOF ish de cause of bokeh.