Black Straw Grids for the Vivitar 285HV

Step 5 Prepare Your Cardboard

Find some nice sturdy cardboard. I used the box from a food mill, since it was a bit heavier than the box from a twelve pack or some cereal, and it had a nice smooth finish on the outside.

If you're cutting something up for cardboard, you'll need to make sure you can create a square blank to work from. First, establish one straight edge with a box knife. Then use a square to trim off the adjacent sides, using the edge you just defined as your starting point, keeping the cardboard blank nice and rectangular. Don't bother with the far edge, just make sure not to measure anything using it!