GH2 Faster > f/2.8 , wider > 28mm lens for $1-$150?

I know this is probably a long shot since fast wide angle lenses are usually expensive
but I'm looking for a lens that is faster and wider than say a Canon FD f/2.8 28mm which I already have.

A lens that does not vignette (or not much) where the crop factor is acceptable for wide angle?
Sharpness is not that important since I will be shooting at the fastest setting anyways and will do some sharpening in post.

I'm on a low budget but I thought I'd ask anyways.

I've looked into those 25mm f/1.4 cheap c-mount CCTV lenses but they vignette a lot, can't comment on the rest.
I hear there's a Pentax at that focal length around but it's almost impossible to find.

So, any suggestions?
 
If you're truly not worried about sharpness, you could just buy a 0.5x or so wide angle adapter for your 28mm
 
Panasonic 20mm/1.7: wide and fast (sell the 28mm and save up to increase your budget)
Canon FD 24mm/2.0: bit wider and bit faster than 28mm/2.8 (watch eBay)
 
Tamron made a 24/2.5 that should be under $100-

I also have a Vivitar/Kiron 24/2 that was way under $100 but that was at least a couple of years ago.
 
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