More images are available for Saturday, November 14th, 2009
Orion @ 400mm
Canon EOS 50D [modified IR response in Hα 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. EXIF:
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