Step 1: Gather Materials
- Zipper lock bag: 1 Gallon size is fine for a DSLR and a medium zoom lens.
- Filter to fit your lens: You probably want a transparent "Skylight" or "UV" filter. I got cheap ones for this project because I expect them to take some abuse.
- Sealing tape: I used electrical tape, but duct tape might provide a superior seal. The tape will only touch the bag and the outer ring of your filter, so if it leaves gunk behind, it's no big deal.
- Marking implement: Fine-tip sharpies write well on plastic bags.
- Cutting implement: A small pair of scissors works well.