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Tamron 200mm lens on QSI583. H-alpha (red) and O-3 (blue/green). 10 x 8 minutes each at -25C.

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Comment by Greg Marshall on July 12, 2011 at 2:00pm
Thanks, Steve. I like the Tamron a lot in terms of optical performance. It at least matches, if not exceeding, the image quality of the Nikkor 70-200 f/2.8, which costs 3 times as much. However, the Tamron doesn't have image stabilization and is somewhat slow at auto-focusing. Neither of these matter for astro-photography, but I actually bought it for photographing jazz performances and sometimes wish I could afford the Nikkor for that.
Comment by Steve Coates on July 12, 2011 at 1:45pm
Looks awesome Greg. That Tamron lens is quite the performer.

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