Here is a tipster that will show you how you can get the focus right every time. All you have to do is measure the distance between your camera and the subject that you are shooting.
Focusing on a Lomo LC-A for instance, is very tricky. If you don’t get it right, you get blurry and out of focus photos. The zone focusing in the LC-A has 4 options : 0.8m , 1.5m, 3m and infinity. Basically, what I do is measure my hand. The whole arm is about 0.78 meter, two arms is equal to 1.5 meters and so on. (take a meter stick or ruler and measure yours, from palm to your shoulder).
So there is 0.80m from my eye to the wall. That’s how I estimate the distance when I’m shooting with a Lomography Camera. Do this or carry a meter stick/ruler and measure every time your subjects are at a distance. Either way, it’s important to get the distance right so your photos to be as sharp as they can be.