Originally posted by hjoseph7 I'm still trying to figure out the Green Button on the back of my K5 II and I had the camera for 7 years now.
See skierd's post #13. In "P" mode, you can override the automatic system if you need changing to either a preferred shutter speed or aperture, simply by doing so using your thumb or finger dial, without having to first change the mode dial to Av or Tv. Then a touch of the green button will restore full "P" operation. This activation is the unique Pentax Hyper Program operational design, so fast and efficient for making changes on the fly, just as skierd says.
Also see Steve's post #4. In Manual mode, instead of the usual twirling of thumb and finger dials to set your exposure according to the meter reading, you can simply hit the green button to instantly set exposure, according to the program line setting. Then, if you prefer a different shutter speed or aperture than the camera has chosen, first hit the AE-L button to preserve the exposure value, then using your thumb or finger dial to select your preference of either and the other will follow along to preserve your set exposure value! This system is very fast and efficient. Especially so when needing to do some spot metering around a scene having tricky lighting, to bias the exposure for a portion of the scene of interest and get the balance you are after- very quickly!
The Pentax Hyper System did first appear way back in the mid-1990's with the Z-1 aka PZ-1 35mm film camera, as rpjallan reports in post #18. I sure fell in love with it when I got my PZ-1p, and was delighted to find it being continued in Pentax DSLR cameras as well! It is a brilliant concept.
Last edited by mikesbike; 05-22-2020 at 07:12 PM.