Controlling softbox spill

I've been wondering. I'm sure there's 101 ways to do this, but what would be one of the better/cheaper ways to prevent soft-box spill? A GOBO? I'm looking to prevent soft-box spill onto the floor when I'm shooting up at the model from below. I don't want the floor to be illuminated, but I also want to make sure the legs are at least illuminated, even if slightly darker than the rest of the photo. Should I just angle the soft-box upwards? I haven't tried it yet so I was just wondering if there was something easy to throw into the mix that could precisely control the spill.

Thanks!

Tag. Interested.

gridded softbox

Angling it up would work fine for what you are wanting to do because the fall off will allow the floor to not be illuminated and the models legs will be somewhat lit but not like the rest of her body. Grid would also work.

Dave

Black foamcore works great.

Grid the softbox.
Angling it up so you feather the light
Gobo/flag works too.

foamcore

Any black flag/gobo along with proper angle will eliminate the spill.
Grids are expensive, so feathering and flag's/gobo's are the simplest way, IMO.

Black velvet or a similar material will actually absorb light. I have a black heavy duty Harley Davidson blanket that I use to reduce light and stop glare. Works great, but it cost me $25K dollars and came with a motorcycle

Grid your softbox. I always purchase a grid with all my softboxes for tight control of the light.

Grids are great, but they aren't as percise as a flag and can still allow spill to happen.

Adding a bottomer to the softbox with cut the light exactly where you want it. And they can be as cheap or as expensive as you want. There are all sorts of flags out there that all pretty much work the same way, they cause a shadow to fall where you want it to. One of the cheaper and simpler ways to flag off a softbox is with the forementioned foamcore. Go to an art store and get a piece of black-on-one-side, white-on-the-other foamcore, clip it to a stand, black side facing the light and there you go. Your softbox spill is flagged off.