You can only set your aperture to f/2.8 If you lens allows this. 
You lens "largest" aperture appears to be f/5.6 that you had attached to the camera.
Check the markings on the lens or consult the documentation that came with the lens for its aperture range.
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I use Pentax K10D. Pentax lens: 18-55mm, 100mm Macro, 50-200mm Zomm, Sigma 10-20mm and 50mm Prime.
Okay to edit and repost my pictures on DPS.
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