||Sunobservation with projection
|The projection method
However the telescope can be used as projector, since the sun exhibits a very high
light intensity. Easily I caught a 10 cm a large picture of the sun on a screen, while the eyepiece was attached
in approximately a distance of 20 cm.
Never look into the telescope, if it is aligned to the sun. cornea lens and retina will
scorch immediately. Your eye is destroyed irreparably by the extremely bundled solar power.
Advantages of the projection method:
We receive large pictures of the
sun. With my telescope (objective diameter 4 ", focal length 1000 mm, eyepiece focal length 9.5 mm) sun pictures
are up to a diameter of 38 cm possible.
- Several observers can look at the sun picture on a screen at the
- The pictures can be drawn at the screen, if this is fastened stable.
- The method is
Disadvantages of the projection method:
Back to observation of Sun
- Accurate aligning
of the screen is necessary for distortion-free pictures.
- The screen must be adjusted at the telescope to
avoid the sun run.
- The aligning of the telescope to the sun is difficult, since you cannot in-look
directly into the eyepiece (see above).
- If refractors heat up locally by absorption cemented lenses may
misalign. Using reflectors the mirrors may distort.