Re: Anyone shoot the eclipse?

On Sun, 24 Feb 2008 09:01:38 -0700, "Roger N. Clark (change username
to rnclark)" <username@xxxxxxxxx> wrote:

Steve wrote:
On Sat, 23 Feb 2008 16:39:44 -0700, "Roger N. Clark (change username
to rnclark)" <username@xxxxxxxxx> wrote:
The moon rotates in the sky with the rotation of the earth.
From our point of view on the earth, the moon rotates as it moves
across the sky with respect to our local horizon.
For example, when the moon is rising, the north
pole of the moon would point approximately to the left
in an image, but would point to the right when it is setting
(from the northern hemisphere).

If you put your camera on a motor driven equatorial mount and point it
at the moon, you don't have to worry about the moon rotation causing
blur because it rotates at the same rate as it orbits. If the north
pole of the moon is on the left of your image frame as the moon rises,
it will still be on the left of your image frame as the moon sets.

Well, there are multiple issues with what you say:

1) The original discussion was not talking about using an
equatorial mount.

The original discussion was talking about the blur while using a fixed
tripod with exposures as low as 2-4 seconds. And that has nothing to
do with rotation of the moon. Only rotation of the earth.

Steve
.

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