Originally posted by angryannie @MSL, I have the 18-55 kit lens. I have no film experience whatsoever. I'm just kind of winging it. I've taken a few thousand pictures but I'm only happy with about 5 of them.
Well my success rate is a little bit better than 5/1000, but not by much. I don't know the settings or features of the K-x so I might get a few things wrong here, but bear with me. I'm going to try to keep things painfully simple, which of course means it won't be fully accurate. But with any luck some of this will be useful.
- the 18-55 lens is capable of good images, and great ones under the right conditions. but it can also disappoint at times and this has been discussed in many threads. for general photography it is fine, and I started out with that lens too
- if the important part of the image isn't in focus, you will be disappointed, unless you are deliberately going for a soft look which can be the case for portraits. As such there is a tendency to focus on what is in the middle of the exposure and to put objects in a central pose. This isn't a bad way to start out, but if you read enough you'll start to hear about the rule of thirds, depth of field and other terms that will affect the way you take pictures
- as a minimum you need to understand the trade off between shutter speed, aperture and ISO. If you aren't shooting fast moving object, the main issue about shutter speed is making sure it is fast enough to avoid blurring caused by camera motion. If you stay about 1/200 you will certainly be fine, and once you learn to hold the camera steady when you push the trigger, you will be able to go to slower speeds. Aperture will affect how much light enters through the lens to the sensor. The smaller the aperture, which translates into a larger f-stop, the less light but conversely the more of your image will be in focus. At 40-50mm range, shooting at f 3.5 or so will give you a very narrow depth of field no matter how far away the object is. That means that you really need to focus on the part of the object that matters. For portraits that is usually the eyes. At f16, for example, a lot more of the image will be sharp so you don't need to nail the focus to the same extent. If you happen to focus on the nose rather than eyes, the eyes should still look sharp. So between shutter speed and aperture you will determine how much light hits the sensor. Whether that is enough light to make an image will depend on what ISO setting you pick or let the camera pick. But the higher the ISO, the grainier the image. Shooting anywhere between 100-800 should work well for any Pentax DSLR. Newer ones can go much higher and still produce an image that is usable; I'm not sure about the K-x.
I'll stop here for now. If you would like more information online, the best photography site I have found is
Cambridge in Colour - Photography Tutorials & Learning Community