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Old Oct 21, 2005, 6:49 AM   #11
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I've taken many pictures through the screen of my sunroom and they all have that "soft" look. (Sometimes, it doesn't look all that bad!) I'm betting the screen got you, badhabbit05.
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Old Oct 22, 2005, 4:48 AM   #12
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Good case to learn from
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Old Oct 24, 2005, 1:11 AM   #13
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Anyone willing to do a little homework as well as a little work with their hands can build an equatorial mount. The stars do not move in straight lines, they follow curved paths. If you want to follow the path of a star across the sky, and snap a clear exposure, you must track it. The equatorial mount has two axis. One is parallel to the axis of the earth. This main axis, is always orientednorth south. (for this you must know your latitude) Usually, the north star, polaris, is a good target to line up the axis (Northern hemisphere). The other axis, takes care of the declination, or height of the star. It rotates 90 degrees to the main axis. Once the main axis is set, it is only necessary for the apparatus to track using the motion of the declination axis. Attatching a motor which is set to drive the declination axis about the main axis, at a speed of one revolution in 24 hours, will effectively keep a telescope or camera, tracking any star it is focused on. Building an astronomical telescope by yourself, including grinding the optics, figuring the mirror, and doing all the calculations involved in testing it, are within the means of anyone interested enough to devote around 200 hours to the project. I have successfully completed 6 of these myself, and assisted in another 6. It's wise to start with a four inch and work up to an eight inch. Beyond eight inches in diameter the difficulty increases exponentially. Each mirror must be calculated and ground and polished and figured so that it is accurate to within 1/4 wavelength of yellow green light. Simply stated this is equal to 55 ten millionths of an inch! Whoops! Sorry, I'm getting carried away. Point is, a home made equatorial mount can be built, and using one is interestingfun.Best regards,

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Old Oct 24, 2005, 11:30 AM   #14
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Here's one I shot through a screen a while back. Note the similar effect.


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Old Oct 24, 2005, 12:51 PM   #15
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Tom LaPrise wrote:
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Here's one I shot through a screen a while back. Note the similar effect.

I believe you're on to somethig there. Very similair sort of blur...

Kd
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Old Oct 25, 2005, 6:47 AM   #16
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It's like the "soft focus" effect you get from shooting through a piece of nylon stocking, but exaggerated.
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Old Oct 25, 2005, 7:22 AM   #17
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Full moon :blah:
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Old Oct 25, 2005, 7:23 AM   #18
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oh ok then ...
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Old Oct 25, 2005, 7:24 AM   #19
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Old Oct 25, 2005, 7:25 AM   #20
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