Originally posted by yangfilo The visible light on the screen changes, but not the depth of field.
so the visible light is changing when you open or close the aperture ring manually? correct.
if so, it means it is working.
if you focus on sthing close to you, a bottle or glass, at F of 1.4, you should see a very small depth of field? correct?
to check whether your depth of field changes (becomes bigger) by closing the aperture, you'll have to film sthing (preferably daylight..) and see it on your pc screen.
the lcd simply gets too dark indoors to verify that your depth of field increases when closing down the aperture. With a dslr you have to seriously close the aperture to increase depth of field.