Lens Hole Too Big in Cardboard Camera Obscura?

If the hole is too big, you can build it up by gluing a strip of paper inside the hole.
  1. Cut as strip of paper equal to the hole circumference (3.14 x diameter). Mark off a strip in the middle equal to the thickness of the cardboard. Fold along the lines. Draw tick marks at regular intervals.

    Lens holder strip step 1

  2. Cut slits from the outside edge to each of the tick marks.

    Lens holder strip step 2

  3. Turn the strip into a circle and glue it inside the hole.

    Lens holder strip step 3Lens holder strip

  4. Fold down the little tabs and glue them to the cardboard surface on both sides.

    Lens holder strip step 4

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