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Saturday, November 14th, 2009
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Orion @ 400mm

Canon EOS 50D [modified IR response in range], hooded Canon EF 100-400 mm ƒ/4.5-5.6L IS USM zoom [ φ77 mm ] @ ƒ/5.6, 170 sec. exposure using bulb mode and Satechi TR-A, ISO 800, tracked with Astrotrac. Noise reduction with Nik Dfine. I've also uploaded a de-streaked version here.

I really have trouble getting the polar alignment perfect, I can't see the secondary stars in the polar scope so I use the angle of the big dipper to get the scope rotation close, then align Polaris. It isn't perfect, and consequently I get some streaking as you'll see in the original size.

#astro #tracked

EXIF:

Width: 4752
Height: 3164
Company:  Canon
Camera:  Canon EOS 50D
Shot On:  2009:11:14 00:09:01
Aperture:  ƒ/5.6
Focal Length:  400.0mm
Metering Mode:  Spot
Exposure Mode:  Manual
Flash:  Did Not Fire
Exposure Time:  170.0 seconds
Exposure Program:  Manual
ISO:  800

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