Anyone out there can help me understand whether will I loss any f/stop on a lens shooting crop sensor vs. full frame sensor? Thank you.

No, you won't lose an F-stop.

Nope. But you lose an f-stop of bokeh.

bacilonur wrote:
Nope. But you lose an f-stop of bokeh.

+1

2.8 is 2.8 regardless. However, 2.8 on a crop *looks* more like 4+/- in terms of bokeh instead of 2.8 on FF

Thank you very much.

Yes, just to confirm and clarify: Exposures do not change going from full frame to crop, but depth of field at any given aperture and focal length will be a little greater on a crop sensor. Not by much, but something to note.

Chris M
www.imagineimagery.com

does 2.8 on crop really look like 4.0 on full?

i'm probably wrong, but to me it seemed like 40D+24L at 1.4 looked like 5D+50L at 2.8. that's 2 full stop of difference in dof.

i donno. maybe my eyes are messed up.

JLim wrote:
does 2.8 on crop really look like 4.0 on full?

i'm probably wrong, but to me it seemed like 40D+24L at 1.4 looked like 5D+50L at 2.8. that's 2 full stop of difference in dof.

i donno. maybe my eyes are messed up.

You're adding different focal lengths into the mix here. And giving the longer focal length to the bigger sensor. So in your example here the bokeh may well look like 2 stops different.