How to make your own Camera Obscura!

What you need:

• a large piece of card (70x90cm) 
• a marker pen 
• a magnifying glass lens 
• a biro 
• a craft knife 
• duct tape 
• a long ruler 
•  tracing paper 

How to do it step by step:

1. For your two cardboard tubes, measure and mark a piece of 60x40cm (Piece 1) and next to it one of 58x20cm (Piece 2). WARNING: Place the pieces carefully on your cardboard, you need to cut out three pieces in total: 60x40cm, 58x20cm and 15x15cm. If you don’t place them carefully you won’t have enough space for all of them. 
2. Cut the two pieces out with your knife. HINT: In order to make your cuts straight, use the ruler to steady your hand. 
3. Measure four times the length of 15cm on the long side of Piece 1. 
4. Measure four times the length of 14,5cm on the long side of Piece 2. 
5.  Now use the biro to score the card of both pieces. Your Piece 1 should now show four sections of 15x40cm, your Piece 2 should show four sections of 14x20cm.
6. Once folded, use your duct tape to hold Piece 1 and Piece 2 together incividually. 
7. Now you need to cut a piece the size of the end of the outer tube, 15x15cm (Piece 3). 
8. With your marker, make two lines (from corner to corner) which cross in the middle to show you the center of your piece. 
9. Now place the lens in the middle of this cross and mark its outer lines. 
10. Remove the lens and mark and cut a small square in the middle of the circle. The size of this square depends on the size of your lens, if your lens has a diameter of 7cm, your square should have a side length of 5-6cm. 
11. When the square hole is cut out, place the lens in the middle of Piece 3 again and stick it on the card with duct tape. Make sure the duct tape does not cover the entire lens, you need to be able to look through the square you cut out. 
12. Place Piece 3 on the end of Piece 1 and fix it with duct tape. 
13. Cut out a piece of tracing paper the size of 16x16cm and tape it on the end of your Piece 2. 
14. Now slide Piece 2 into Piece 1 so that both covered ends are on the same side. 
15. Your Camera Obscura is ready for use: go outside and try it out. HINT: You can focus by sliding Piece 1 to and fro. Your image will be upside down, this is a natural effect caused by the lens. 

Special Idea: It will be even more fun to use your Camera Obscura when you paint it and make it more colorful.


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Source: https://www.youtube.com/watch?v=Y0wenfVfHuo