On Mon, 17 May 1999, John Carmichael wrote:
Hi Ross:
Getting a small, very long focal length lens (or mirror) to replace the
pinhole
can solve the problem, at the risk of introducing some image aberrations,
including chromatic, visible at the edges of the solar disk. This was of
course
John Carmichael wrote:
Hi Ross:
A little, off-the-wall, query. The larger the distance from the pinhole to
the
white sheet image of the sun, the larger the sun, but also the dimmer too.
This is correct. The sun's image becomes quite dim at the long distance
needed to see sunspots.
Hi Ross:
A little, off-the-wall, query. The larger the distance from the pinhole to the
white sheet image of the sun, the larger the sun, but also the dimmer too.
This is correct. The sun's image becomes quite dim at the long distance
needed to see sunspots. This can be corrected by lowering
My favorite way to show eclipses and sunspots is with a reflective pin hole
camera. A small mirror, preferably front surface, about .25 to .5 inches in
diameter mounted on a camera tripod. The light from the sun is reflected
through a window into a darkened room onto a white wall or screen. Its
Message text written by John Carmichael
By the way, did you know that you
can use a shadow sharpener to see sunspots on the sun?
Hi John,
It's hard to see if the image is too small though.
The most unusual way I've ever seen sunspots is *directly*.
I was driving west at sunset on an *extremely
On Sun, 16 May 1999, Chuck O'Connell wrote:
The most unusual way I've ever seen sunspots is *directly*.
I was driving west at sunset on an *extremely humid* hot
august evening. As my car crested a hill the
sun was sitting on the horizon, *easily* viewable because
it was so washed out by
