Assemble a Pinhole Camera from a Single Sheet of Poster Board | #celebratephotography « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Pacon Half-size Sheet Poster Board - LD Products
Poster Board - CVS Pharmacy
Daler-Rowney Studland Mount Board A1 Poster Black
Standard Poster Size, Dimensions & Design Guide UK | Banana Print