I recently was playing around with my camera (Canon 60D) in a low light situation trying to focus on some subjects across the room. I noticed once getting home and getting the images onto the computer that the image quality was absolutely horrible. I was so very frustrated with such poor quality.

This is atypical, as my lens / camera combination have taken some very sharp pictures in the past (and do most of the time). I could understand if I had an issue with camera shake / long exposures, etc, but that is not the case here.

**Below are the specs for the shot**:

* Camera: Canon 60D
* Lens: Canon 50mm f/1.4 USM with a UV filter
* Aperture shot at: f/1.4
* Exposure: 1/160 sec
* ISO: 640

I shot over 100 images and they almost all look the same, extremely soft, almost like there isn't a focus at all to the image. You'll also notice TONS of chromatic aberrations (In the window, its entirely outlined in purple).

Did my lens not focus? Does low light simply not take as sharp of photos even with decent exposure time/ISO/aperture? Is this caused by a dirty lens? If so, why am I not seeing this in brighter situations?

Any help would be appreciated!

(Large version: [http://i.stack.imgur.com/ydWqf.jpg](https://i.stack.imgur.com/ydWqf.jpg))

![Blurry image](https://i.stack.imgur.com/ydWqf.jpg)

Update
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FYI - I used 1 point of focus versus all focal points on the camera (excuse my lack of detail here, I'm not positive what those points are called exactly).