Congratulations on getting this bargain for an exceptional camera! There are cautionary things to be aware of in terms of expected results (as with any DSLR). Instead of jumping in with all fours to all the complexities, the first thing to learn well are the basics of photography, and how knowing this can bring results not possible from the likes of smartphones, etc. The first thing not to do is have your mode dial set on "Auto", which is the default setting for the camera, new in the box. When thus set, the camera makes all decisions, including which of the Custom Image processing categories will be selected, and does not inform you of its selection, in addition to ISO, aperture and shutter speed values, which will be revealed. This setting also will defeat most controls, and most adjustments will not be available, including the exclusive Pentax Hyper System.
So for fully automated exposure set by the camera, choose the "P" (Program) setting instead, which has none of the above deficiencies. You could keep the ISO set to Auto if you wish, but I would recommend switching to setting it yourself, to experience how this affects your other exposure settings and your outcome. (hint-on a bright, sunny day, set ISO 100 for best results, unless needing an extremely high shutter speed and smaller aperture (larger number). At least for the time being, in order to concentrate on learning to deal with exposure, lighting, composition, etc. you can just go right ahead shooting highest-quality JPEGs right out of the camera. Just be sure to go into the Custom Image menus to set up "Fine Sharpening" especially in the most often used "Bright" category. Access is via the "info" button, then the 4 buttons surrounding the"ok" button will be for navigation. When you have achieved this setting, hit "ok" and turn off the camera, which will exit the screen. Any trouble doing this, just give a shout.
The Pentax Hyper System, when the camera is set to the "P" mode where the camera will select both your shutter speed and your aperture according to its light meter reading, allows you to instantly intervene with the camera's decisions. If you decide you need a different shutter speed, or aperture, you can immediately change either with the thumb or front finger-tip control wheels, and the camera will simply obey, switching you instantly to Av or Tv mode which will remain until you either hit the green button to restore full "P" automation, or turn off the camera. This is the Pentax Hyper Program mode. This is the fastest-operating system out there for making changes on the fly.
Learning about the goals and conditions where you will need to control either shutter speed or aperture full time for what you will be dealing with, and will switch to Av or Tv mode to meet this need, is also a key aspect to master. (hint- a key factor of shutter speed is in dealing with or control of motion, while a key factor of aperture is in dealing with or control of depth-of-field [DOF] which is how much of the field behind and in front of your main subject will appear in sharp focus.) Of course, the balancing act between the two also relates to how much light comes in for your exposure, along with ISO.
The normal segmented "matrix" metering pattern is very good in dealing with a variety of lighting conditions. However, there are numerous lighting situations that can fool even the most sophisticated of light meters, and learning to recognize them right away before shooting, and how to deal with that particular situation, is a key factor in learning photography. In such circumstances it is often best to switch to the Manual mode so you decide both aperture and shutter speed, and how to do meter-reading for best results, especially how to use spot metering. When metering with your own eyes on the indicator, with spot metering you can choose where in your scene would be best to base your exposure on, and read off of that spot. It should be a mid-tone point under the lighting that will be in your composition. This will take practice, and we can help. With other makes of DSLR, the normal thing is to twirl the thumb and finger dials to set your aperture and shutter speed according to your meter reading to get the right exposure, which takes a bit of time, especially if you want to take readings from several spots. But with your Pentax camera's Hyper System, just hit the green button for instant setting of both aperture and shutter speed to get your correct reading of that spot. When your readings are done, if you wish a different shutter speed or aperture, first hit the AE-L button to freeze that exposure, then go ahead and change either and the the other will follow along to keep your exposure value. You won't have to spin both dials to compensate. The is the Pentax Hyper Manual operation. Once you have thus set up your exposure, then move your camera to your preferred composition, and keeping in the M mode, ignore further indications of the meter. Much faster than any other make out there.
When using spot metering, be sure to switch back to the normal matrix metering when you are done. Leaving in spot metering can screw up your usual shooting!
Last edited by mikesbike; 07-08-2021 at 08:07 PM.