Total Lunar Eclipse
August 28, 2007
|
| Other names: |
— |
| Optics: |
Takahashi FSQ-106ED at f/5 |
| Mount: |
Losmandy GM-8 w/Gemini |
| Camera: |
Canon 20D [ Hutech Type I ] |
| Exposure: |
1/3200 through 1/2 second at ISO 400 [ see below for details ] |
| Accessories: |
Canon TC-80N3 |
| Location: |
Ontario, CA |
| Date |
August 28, 2007 |
| Notes: |
Processing: Levels, curves, unsharp mask, and compositing in Photoshop.
A Total Lunar Eclipse. As the Sun's light spreads out through space in all directions, objects in the path of that light create shadows. The shadows are always present but not noticeable unless something passes through the shadow. That's exactly what the Moon does during a lunar eclipse; it passes through Earth's shadow. Why isn't the Moon completely invisible? The Earth's atmosphere absorbs, reflects, and scatters the various wavelengths of light coming from the Sun. It scatters the shorter wavelength green and blue light, leaving the longer wavelength of red light to pass through the atmosphere, get slightly refracted, and fall on the Moon.
Top row of images:
First 4: 1/3200th of a second
5th: 1/2000th of a second
Last 3: 1/10th of a second
Totality image: Five images at 1/2 second each, combined in Photoshop CS2.
Click the image for a larger version (1200 x 900, ~570 KB).
|
|
