How to make a telescope solar filter to look at the sun?

Cut several exposed photographic negatives (the front part of a roll has been completely exposed) (increase or decrease the number of negatives according to the intensity of sunlight, but it must be more than two), cut them into glasses frames with cardboard, and stick them on the cardboard glasses frames with transparent tape. When an eclipse occurs, observe the sun through these negatives.

Second, glass.

Paint the glass with ink or smoke black, and the color should be uniform. They should be used to observe the solar eclipse, and the sun is bronzed.

Third, plastic sheets.

1. Take a transparent plastic sheet (such as the resin sheet supporting the neckline in the shirt package), cut it into two glasses, and then smoke it evenly with candle smoke. The degree of blackening can be tested in the sun.

2. Cut the glasses frame with cardboard.

3. Stick the blackened plastic sheet on the cardboard spectacle frame with transparent tape.

Fourth, the basin

Pour the ink into a basin of clear water and observe the sun by reflecting the image. This method was used by ancient people in China to observe the solar eclipse.

V-pinhole projection

Make use of two boards, dig a small hole in one board, and let the sunlight pass through this small hole and project onto the other board. At this time, the image of the sun will be projected on it, and it is safe to observe with the naked eye.

Six, telescope projection

Hold the telescope tightly to prevent the shadow of the sun from dangling. But don't look at the sun directly with a telescope, or you will burn your eyes and cause blindness. If you want to observe with a telescope, you must add a filter to the lens. In addition, photographers can't shoot the sun directly with a camera without filter protection.

Seven, computer disk core

You can use the black film in the floppy disk as the lens, cut it into glasses frames with cardboard, and stick it on the cardboard glasses frames with transparent tape. This can not only achieve the observation effect, but also protect the eyes. It's easier to use a simple sun-watching mirror by yourself. Self-control is better

Eight, welding glass.

You can take off the lens in front of you with a welded mask. It's professional ultraviolet protection.

x ray film

Stack many layers of X-rays or photographic negatives together (in short, the more the better, the more the better), cut them into glasses frames with cardboard, and stick them on the cardboard glasses frames with transparent tape.

Sunglasses

Take sunglasses and draw them in ink.