Originally posted by prayforsnow I am total SLR beginner so excuse me if this question is silly, but if a camera like the K-X has 11 auto focus points but no way of telling which focus point it is using, what is the point (excuse the pun) in having all those extra focus points?
When framing a picture either in LV on the screen or through the viewfinder, is it possible to see roughly which area is in focus? How do you chose a different focus point if the wrong one is selected?
Thanks
First, when you use LV on the LCD screen the camera will give feedback on which
area(s) it focused on and you might see that the other parts are blurry, depending on the lens you use. A wide angle lens makes it hard to see the parts that are in focus, but a telelens has a shallow DOF, so it is easy to see that other parts are blurry.
The K-X LV is identical to any other camera regarding focus feedback.
When you use the viewfinder, than there are three modes of using autofocus on the Pentax bodies.
1) You might just use the center AF focus sensor. Point the center on your subject, half press the button, you'll get the green hexagon, recompose, and press the shutter. The other Pentax models show both the green hexagon localted below in the viewfinder, and a red mark in the center of the viewfinder, the k-x only the hexagon. In this mode there is no real advantage of having the red dot on the other models.
Many people only use this mode, the k-x will do just fine.
2) You select by hand one of the 11 focus sensors. The advantage is that you don't need to recompose, which can be more accurate in some situations. The disadvantage on the K-X is that you'll have to remember which focus sensor you selected, or you'll have to look at the LCD screen to check. The k-x will have a small disadvantage here, if you use this mode often and want to switch while looking through the viewfinder.
3) Have the camera select one or more of the focus sensors automatically. It will normally select one or more of the 9 central sensors, when it chooses wrong you might decide to focus manually or select the AF sensor by hand. On the K-X you will not get this red-dot feedback in the viewfinder, but you can see when it focuses on the wrong subject with shallow DOF lenses because the wrong part of the image will be sharp.
In practice when you use mode 3 you'll be in an hurry and will not have time to adjust the focus point manually anyway, that's the reason I mainly use mode 1
or just rely on the camera's decision. I use mode 2 for macro, but I'm normally not in a hurry than, and might use lifeview anyway when working from a tripod.
So, I believe in most real life uses the K-X will do fine without the extra indicators, at least for me.