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Hi,
Another option to consider would be an ED80. Maybe the aperture is not quite as big as this lens but they do have ED optics and are excellent units for a similar $ (havent seen a bad one yet either).
Realise its not quite the same as a camera lens but they are also very portable if astro is the main consideration. Amazingly good little planetary scopes too for the aperture.
Cheers
David
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