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16"
Dream Astrograph - filtered
tube offering, sample images here at Dream. |
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The following links point to raw FITS files
that, other than dark subtraction, have not been altered in any
way. They are full frame images taken at 1x1 binning. These files
were taken using a STL-11k camera housing, 50mm square Luminance
filter and a custom 4" coma corrector. All images are 20s
and all were taken at the same focus setting. The data shows
the rigidity and optical performance of this telescope at varying
telescope angles. After taking an initial image at a new telescope
angle, approximately 4 minutes was allowed to pass before taking
a follow up image from the same location. We highly recommend
you download some or all of the images and open them in Photoshop
or similar. Enlarge to 300% and evaluate the star shapes, especially
in the corners, for yourself. |
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LOCATION |
TIME (local time) |
IMAGE NUMBER/LINK |
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zenith |
11:51pm |
1287 |
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west, northwest |
12:02am |
1297 |
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12:05am |
1298 |
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south, southwest |
12:08am |
1299 |
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12:13am |
1300 |
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north, northwest |
12:16am |
1301 |
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12:20am |
1302 |
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north, northest (meridian flip) |
12:24am |
1303 |
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12:29am |
1304 |
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east, northeast |
12:31am |
1305 |
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12:35am |
1306 |
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southeast |
12:38am |
1307 |
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12:42am |
1308 |
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west (meridian flip again) |
12:45am |
1309 |
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12:49am |
1310 |
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The telescope was daytime collimated using
the custom 3" collimation tools that Dream had developed
exclusively for the Dream Astrograph telescopes. When these tools
are used properly there is no need for non-intuitive, frustrating
CCD collimation. All Dream Astrographs are tested in Dream's
observatory prior to shipping them to our select customers. |
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