I have both lenses and I do like 50/1.4 more.
And my recent favorite is 35/2.

For night shooting tripod works miracles :)
If you do not need AF cosider Voitlander 58/14 (excellent lens!) or
old Cosina 50/1.2

--Sasha

On 2/25/09, Fernando <[email protected]> wrote:
> I have both lenses, their uses are different but if I had to get only
>  one I would go for the 50 (actually the 35/2 looks more useful to me,
>  but that depends what the intended use is)
>  2 stops is a lot of diffence.
>
>  Weight what is more important for you and choose accordinly, but on
>  the K10D the DA40 looses its main appeal: size.
>  You are trading 2 stops (in other words the chance to take more
>  pictures without flash, the chance of using a smaller depth of field
>  in your photos, etc) for size (which again is somehow lost in a larger
>  body).
>
>  Still, I use them for different purposes, the 50 is more like a
>  portrait lens in digital, the 40 goes when I want to make my camera
>  small and get a tight normal.
>
>
>
>  On Wed, Feb 25, 2009 at 1:07 PM, Amirkambiz Hamedanizadeh
>  <[email protected]> wrote:
>  > Dear Pentax colleagues,
>  >
>  > I want to buy a lens for indoor and night shooting. I wonder which of the
>  > following lenses is better:
>  > . Pentax SMCP-FA 50mm f/1.4 Lens
>  > . Pentax SMC DA Lens - 40 mm - F/2.8
>  >
>  > The body is K10D, and the other lens that I have is Pentax 18-250.
>  > Is there lots of difference between F1.4 to F2.8?
>  >
>  >
>  > Cheers,
>  > Amirkambiz
>  >
>  >
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>  http://www.flickr.com/photos/ferand/
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