Here is the result :
This lens is a fix lens, and it is in the range of Zoom lens.
You can go on my Pbase and you will found the answer quickly, but for who wants to play the game, just give some tried before
All the picture as been taken at ISO 200, aperture from F/2.8 to F/16 (oups ! i have gave a hint !
at F8.0

100 % crop last picture:

at F2.8

at F2.8

100 % crop last picture:

at F16

100% crop :

at F.28

Regards,
Frank