Northern Prairie Wildlife Research Center
Put together with wood screws and glue (for added strength) two rectangular halves each the same size. Let dry.
Add 3 hinges along top edge of blind so halves will fold together like a closed book.
Use a second person to hold halves open to the desired height you wish blind to maintain during use. (The desired angle would likely be close to 90 degrees.) Pick a point half way between the top and bottom of the blind. Use small screws to attach a length of chain to keep blind open in desired position.
Staple canvas to frame. Make sure if canvas is attached while blind is completely open that enough slack material is left to enable folding blind back together.
The canvas at end of the blind can be left loose or tightened by cutting out extra material and stapling to one side.
Cut camera hole in one end only large enough for camera lens to fit through.
Note: This blind is an inexpensive method of gaining concealment for taking wildlife photographs. Since you must lay flat, it is not the best choice for marshy areas where water covering the ground may be a factor. A dense foam sleeping mattress may be helpful to keep you off the ground. A sandbag or beanbag works well to steady your camera or lens. A tall person may need to start with 7' or 7 1/2' 2x2 lengths.