Canon wide angle lenses

[Willow127mm]

Hi all I'm looking for a lens for wide field landscape and sky /space shots.
Must be compatible with Canon Eos
Less than 18mm desirable.
Don't want to spend a fortune
Please PM me if you can help.
Cheers Brad

[MortonH]

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http://www.iceinspace.com.au/forum/showthread.php?t=135344