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1.1

Minor Versionm

by J Mary Leiza

Introduction

A pinhole camera is a simple camera without a lens but with a tiny aperture. When light passes through this tiny aperture, it projects an image of the object being observed through the aperture. In this TACtivity, we will make a pinhole camera using a chart paper, butter paper, and tape to see lovely images.

Video Overview

    • Handle the scissors with care.

    • Light the candle under adult supervision.

    • Be aware of the pointed end of the thumb pin.

  1. Take an A4 sized black chart paper. Fold the paper into two equal halves along the longer side, getting two A5 size pieces. Open the  folded paper. Taking the centre crease as a reference, cut it into two equal halves using scissors. One half will be used to make an outer box and the other will be used to make an inner box of the pinhole camera.
    • Take an A4 sized black chart paper. Fold the paper into two equal halves along the longer side, getting two A5 size pieces. Open the folded paper.

    • Taking the centre crease as a reference, cut it into two equal halves using scissors.

    • One half will be used to make an outer box and the other will be used to make an inner box of the pinhole camera.

  2. Take one of the paper halves. Using a pencil, divide its longer side into four 5 cm sections, starting from one edge. Leave the extra part as it is, after marking is completed. Fold each part at the marking, one by one using a ruler.
    • Take one of the paper halves. Using a pencil, divide its longer side into four 5 cm sections, starting from one edge.

    • Leave the extra part as it is, after marking is completed.

    • Fold each part at the marking, one by one using a ruler.

  3. By folding the paper at each marking in one direction, you will get a cuboid box. After making the box, make sure that the extra part of the chart paper appears on the outer portion of the box. After making the box, make sure that the extra part of the chart paper appears on the outer portion of the box.
    • By folding the paper at each marking in one direction, you will get a cuboid box.

    • After making the box, make sure that the extra part of the chart paper appears on the outer portion of the box.

  4. Stick the extra part of the chart paper, to box using insulation tape. While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box to tightly secure it. While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box to tightly secure it.
    • Stick the extra part of the chart paper, to box using insulation tape.

    • While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box to tightly secure it.

  5. Take the other half of the paper. Using a pencil, divide its longer side into four 4.8 cm sections, starting from one edge. Leave the extra part as it is, after marking is completed. Fold each part at the marking, one by one using a ruler.
    • Take the other half of the paper. Using a pencil, divide its longer side into four 4.8 cm sections, starting from one edge.

    • Leave the extra part as it is, after marking is completed.

    • Fold each part at the marking, one by one using a ruler.

  6. By folding the paper at each marking in one direction, you will get a cuboid box. After making a square box, make sure that the extra part of the chart paper appears on the outer portion of the box. After making a square box, make sure that the extra part of the chart paper appears on the outer portion of the box.
    • By folding the paper at each marking in one direction, you will get a cuboid box.

    • After making a square box, make sure that the extra part of the chart paper appears on the outer portion of the box.

  7. Stick the extra part of the chart paper, to the box using insulation tape. While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box, to tightly secure the box. While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box, to tightly secure the box.
    • Stick the extra part of the chart paper, to the box using insulation tape.

    • While sticking the insulation tape, ensure to leave an extra portion of the insulation tape on both the ends. Fold and stick the extra portion inside the box, to tightly secure the box.

  8. Take a butter paper and place the inner cuboid box on it and trace its boundary. This will give you a square shape. Using a scale, draw another square around the traced square, such that the gap between the two squares is 1 cm. Join the corners of the two squares by dotted lines.
    • Take a butter paper and place the inner cuboid box on it and trace its boundary. This will give you a square shape.

    • Using a scale, draw another square around the traced square, such that the gap between the two squares is 1 cm.

    • Join the corners of the two squares by dotted lines.

    • Cut along the dotted line.

    • Now, take an OHP sheet, and follow the same steps as we did with butter paper.

  9. Place the OHP sheet screen on one of the openings of the inner cuboid box and fold the extra part. Using insulation tape, stick the extra part to the inner cuboid box. Now, place the butter paper screen on the OHP sheet screen as shown. OHP sheet is used to support the butter paper and avoid wrinkles in the butter paper.
    • Place the OHP sheet screen on one of the openings of the inner cuboid box and fold the extra part. Using insulation tape, stick the extra part to the inner cuboid box.

    • Now, place the butter paper screen on the OHP sheet screen as shown.

    • OHP sheet is used to support the butter paper and avoid wrinkles in the butter paper.

    • Using insulation tape, stick the extra part to the inner cuboid box.

    • Make sure the screen is plain without any folds or creases.

  10. Now, using black chart paper instead of butter paper, repeat step 8 and step 9 to cover the other opening of the inner box, as shown in the picture. Now, the inner box has both the openings covered. One made from butter paper and the other from black chart paper.
    • Now, using black chart paper instead of butter paper, repeat step 8 and step 9 to cover the other opening of the inner box, as shown in the picture.

    • Now, the inner box has both the openings covered. One made from butter paper and the other from black chart paper.

    • Similarly, repeat step 8 and step 9 for the outer box using black chart paper, to cover only one opening.

    • Now, the outer box has only one of the openings covered with black chart paper.

  11. Join the opposite corners to locate the centre of the square, on the covered outer box end. Make a hole at the centre of the square, on the outer tube using the given thumb pin. Now, increase the size of the hole at the centre of the square, on the outer box using the given Skewer stick.
    • Join the opposite corners to locate the centre of the square, on the covered outer box end.

    • Make a hole at the centre of the square, on the outer tube using the given thumb pin.

    • Now, increase the size of the hole at the centre of the square, on the outer box using the given Skewer stick.

    • Don't make the pinhole very big (> 2 mm).

  12. Make a bigger hole at the centre of the covered end (black chart paper) of the inner box, using a pencil or scissor. Slide the inner box into the outer box, such that the butter paper screen is inside the outer box. Slide the inner box into the outer box, such that the butter paper screen is inside the outer box.
    • Make a bigger hole at the centre of the covered end (black chart paper) of the inner box, using a pencil or scissor.

    • Slide the inner box into the outer box, such that the butter paper screen is inside the outer box.

  13. View the image formed on the screen from the open end of the box, by pointing at any real objects/buildings/trees. Move the inner box, to and fro, to adjust the focus of the object. Try to avoid bright light entering into the camera from the viewing side.
    • View the image formed on the screen from the open end of the box, by pointing at any real objects/buildings/trees.

    • Move the inner box, to and fro, to adjust the focus of the object.

    • Try to avoid bright light entering into the camera from the viewing side.

    • In the second picture, you can see the inverted image of a candle, as seen through the pinhole camera.

    • In the third picture, you can see the inverted image of a girl standing, as seen through the pinhole camera.

  14. Make a small cut, at the bigger hole of the viewing side as shown, to fit your phone camera to take beautiful inverted pictures through the pinhole camera. Make a small cut, at the bigger hole of the viewing side as shown, to fit your phone camera to take beautiful inverted pictures through the pinhole camera.
    • Make a small cut, at the bigger hole of the viewing side as shown, to fit your phone camera to take beautiful inverted pictures through the pinhole camera.

    • Can't focus at the image - The flame of the candle and the hole at the centre of the pinhole camera should be aligned.

    • Image is not clear - Following are the reasons:

    • The pinhole size is too big.

    • Too much external light entering from the viewing side.

  15. Use white paper instead of black chart paper. Punch multiple pinholes instead of one pinhole. Use a transparent material like OHP sheet as screen.
    • Use white paper instead of black chart paper.

    • Punch multiple pinholes instead of one pinhole.

    • Use a transparent material like OHP sheet as screen.

Finish Line

Raghottam Joshi

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