Reviews and Problems with Pentax DA 40mm f/2.8 Limited
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fisheye freak, pentaxforums.com
29 January 2008
Excerpt: Like nearly all Pentax lenses, it is soft wide open and hits its straps down 2 stops. I found it very hard to use the focusing ring - too small. Quite credible optically, good replacement of a 50mm as a standard lens for those that like it a bit wider. Have a 35 f/2 , so sold off the 40mm while it stil had its cult status. The cult status is probably only for the extreme compactness. In general, I have found the M lenses to be not as good as the K lenses optically.