From the manual I read "Maximum Aperture f/2.8 - f/5.4"
You may have missed that on page 202 of http://c758710.r10.cf2.rackcdn.com/files/support/manual/304_1314744970-669564938_manual.pdf
I am a newbie to photography. I have a Pentax Optio 550 which is over 10 years old. I manually tried to set the f stop to f16, but was unable to go over f7.9. The owners manual does not have the answers.
After reading many articles it seems that all digital cameras are capable of setting the stop at f16. What am I missing? Is it my camera or me? Your help is appreciated.