Greetings.  For what you want to do, all other things being approximately 
equal, faster (lower F number) is better.

---- 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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