fast prime for night photography
Hi, I'm getting into nocturnal photography here in Costa Rica and am considering picking up a fast wide angle prime for two reasons -- 1) to get a brighter viewfinder for composing in dim conditions and 2) for occasional short exposures (e.g., 30 seconds) where a fast aperture would be a benefit in allowing me to use lower ISOs. Of course, I'm also counting on a bit of a sharpness boost from the prime, particularly at the wide apertures, compared to my 17-40 mm f4. I can't break the bank, and I also do not need another heavy lens, so I'm considering these two alternatives:
The Canon 28 mm f1.8 (<!-- m -->http://www.bhphotovideo.com/c/product/1 ... _28mm.html<!-- m -->)
The Canon 35 mm f2 (<!-- m -->http://www.bhphotovideo.com/c/product/1 ... _35mm.html<!-- m -->)
I would be using these on a 5D body and don't care about noisy/slow AF. I'm interested basically in sharpness from the widest aperture through to f16. I will be using this lens for moonlit landscapes and stars (as points and trails).
Can anyone help me with impressions of these lenses and/or suggest possible alternatives in a similar price range?
Thanks!
Greg Basco