Originally posted by Tiffyk5 Hi,
I'm opened to hear. Thanks a lot!
I use 18-250 Pentax lens.
That is a very good all-around lens for its type. Its best range for best picture quality will be between 18-70mm, but it is still ok throughout. If you want to avoid high distortion, use slightly less wide angle- say around 20-24mm. If you want to avoid darkening of the picture corners, also reduce wide angle as above and/or don't use it wide open at f/3.5, instead f/5.6 or higher. For most pictures, these effects may not be noticeable. But with some scenes they will be. It does not, however, feature WR (Weather Resistant) construction as many other Pentax lenses do. But no zoom lenses of such a focal length range have this type of construction. The K-5 series bodies and all more recent Pentax DSLR bodies feature WR construction, so if some rain begins to fall, one can still shoot pictures. But without a WR lens this does not apply.
So you have a good lens, hopefully you'll soon have a good camera too!