 |
|
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Object
................................... |
The Southern Cross (Crux) |
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Name
.................................... |
- |
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Date + Time
.......................... |
May
23, 2004
/ 0:00 UT |
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Location
................................. |
Farm Okumitundo, Namibia |
| |
Optics
.................................... |
Hasselblad/Carl
Zeiss 4/120mm |
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Tools
..................................... |
- |
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Detector ................................ |
Kodak Ektachrome E200 Prof.
6x6 cm |
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Exposure Time(s)
................... |
Approx. 30
minutes |
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More Details
........................... |
- |
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Mount
.................................... |
Fixed mounted on a photo tripod |
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Guiding
.................................. |
- |
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Processing Details
................... |
PhotoShop |
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Notes
..................................... |
I focussed this image progressive. I started with a totally
defocussed setting. During the exposure, I changed the focus every
40 seconds in 'infinity'-direction. Before the end of this
sequence I covered the lens for approx. two minutes before I let the light
pass again for about 10 seconds. This last exposure time made the
sharp star at the end of each trail.
I had no watch or stopwatch handy, so I had to count the 40
seconds in my mind: One, two,... Therefore all times are estimated
times only.
This technique shows the constellation as well as the star colors. |