Geoptik Solar Projection Screen "Hossefield Pyramid"

Geoptik Sun Projection Screen ?Hossefield Pyramid?

With the so-called ?Hossefield Pyramid,? you can safely observe the sun by projecting it onto the white field at the bottom of the pyramid. This allows you to see the sun in so-called white light and study sunspots or a Mercury transit in peace and quiet.

The projection gives you a large image of the sun, which is high in contrast thanks to the side shielding. Another advantage of the projection method is that several people can observe at the same time, for example school classes.

The projection screen is simply attached like a 1.25" eyepiece. Your telescope should have a zenith mirror or Amici prism. It is ideal for use with refracting telescopes (lens telescopes).

You should only use inexpensive eyepieces. The heat can damage the connections between the optical elements in expensive eyepieces with many optical elements. You should also choose an eyepiece with a sufficiently long focal length so that the sun fits securely into the field of view. This allows all of the sunlight to pass through the eyepiece, reducing the risk of the eyepiece overheating.

The scope of delivery includes eight Stonyhurst discs, which you can use to document changes in sunspots, for example.

Notes

For safety reasons, you should completely remove the finder scope from the telescope when observing the sun. Under the keyword ?sun finder,? you will find special finders that allow you to safely adjust the telescope to the sun.

It is recommended to use simple eyepieces for projection.

The size of the solar image in millimeters is calculated using the following formula:

Solar image diameter = 0.5 x distance of the image from the focal point x magnification

Sun protection screen
8 Stonyhurst discs

An eyepiece is not included in the scope of delivery

Safety informations: PDF Download