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Canon EF 20mm f/2.8 USM

ef20mmf_28usm_1_
Review Date: May 11, 2010 Recommend? yes | Price paid: Not Indicated | Rating: 8 

 
Pros: Center sharpness is great. Quick and fast focus
Cons:
Corner softness at 2.8, improve when stop down. Barrel distortion is there (but acceptable for a wide lens)

I want to get a fast super wide prime lens and there is not that many choices. I do have a 17-40 but want to have a faster lens.

The IQ of this lens is pretty good IMHO, esp for the center, corner is a bit soft shooting wide open but it will improve quite bit after stop down.

I use this lens for portrait and landscape. For portrait, I tend to position my subject in or around the center of the frame so the corner softness is not a problem, and f8 is fine for landscape. Fast lens is the thing you want to have coz you never know when you will need it.


 
Canon EF 28mm f/1.8 USM

ef28mmf_18usm_1_
Review Date: May 11, 2010 Recommend? yes | Price paid: $480.00 | Rating: 9 

 
Pros: Light weight, small size and fast! IQ of f2 and up is great.
Cons:
a bit soft (more like veiling) with f1.8 (still very usable). Color fringes issue with 1.8 but goes away if you stop down to 2.5.

Originally I have 20/2.8, 35/2, 50/1.4 and 85/1.8 but I decide to get a set of prime light-weight travel kit with only 3 lens. I decide to replace 35f2 with the 28/1.8 (still keep the 20/2.8). I think the result of 28 at f2 is comparable to 35 at f2, however 28/1.9 a bit wider and more practical for traveling. Also, it has a much quieter and faster focusing. I think this is a keeper.