I bought this lens a couple of years ago to take pictures of architecture and landscape. In the last two weeks I’ve tried it for my candid street photography. This is the widest lens I have and it requires a very close range to the subject to take a picture. Don’t even think about using the viewfinder and autofocus. The mode of operation is “point and shoot”.
This is not a small glass, but when you are very close to the person it is hard to conceal your intentions anyway.
The lens is fast. I often use it wide open. I don’t think that a faster lens would be useful. When you are in a range of six feet or less, it becomes a shallow depth of field. This makes the misfocus problem more pronounced.
For more pictures go to Shooting with Pentax 14mm f/2.8
Related topics
The Rules and Myths of Candid Photography: Wide angle or telephoto lenses
Candid Street Photo 
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