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The procedure I used to make the "Mark II" reticle was simplicity itself. Here's the drill:
- Cut a piece of tape about 25 millimetres wide by 45 mm long. (Transparent packing tape works well.)
- Lay the tape on a flat surface, sticky-side up.
- You might have to weigh down the corners to keep the tape from curling; I used two paperback books, since the tape can be easily unpeeled from their wax-coated covers.
- Lay some short strands of hair over the sticky tape.
- I used a criss-cross pattern so I would be sure some of the lines would intercept the subject.
- For best results, the hair should be as fine and dark as you can get. If you're curious, this particular strand was contributed by an Oriental woman.
After I'd finished, the tape looked like this:
- Place the prepared tape across the film guide, sticky side facing the shutter.
- Load in the film and shoot some pictures.
- High contrast subjects (white on dark) will give the best results. Even if you can't make the hairs disappear entirely, they will still give a good demonstration of how light can seemingly turn a corner.
One final word: Don't try this with your $800 SLR. (You won't be able to see the hairs through the viewfinder in any case.) I used a dime-store Vivitar T200. It was worth leaving some residual stickum on the film guide for the sake of science.
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