What is the Diopter, where is it at and what does it do.
If you have used DSLR cameras for a while you will probably already know the answer to these questions. If this is your first DSLD you may not have even noticed this very important little knob near the viewfinder. What it does is it allows you to adjust the focus in the viewfinder to match your eyesight so that everything you see in the viewfinder will be nice and sharp. This is especially important if you are manually focusing your camera. The reason I am writing about this is because I was amazed how many people either didn't know it was there or if they did, didn't know how to adjust it properly. Not having this adjusted to match your vision will really give you problems if you manually focus your shots so lets make sure you know where it is and how to adjust it.
Where you can find the Diopter knob
You will generally always find the small knob near the top right hand side of your viewfinder. It is very small and will usually have little ridges on it to make it easier to turn and adjust.
Here is how you adjust it to work with your eyesight
First turn your camera "ON" and remove the lens cap
Next find the little knob. I find it easiest to adjust it with my right thumb on the little button.
While looking through the viewfinder at the information at the bottom of the screen, adjust the knob until you get everything sharp and clear. DO NOT USE what is in your actual view to adjust this, only use the information bar at the bottom of the screen to make adjustments.
The reason for only using the information bar at the bottom of the screen and not the picture is that the camera may not be focused properly and if you use an unfocused picture to adjust this with it will make everything out of focus.
Remember if you use someone Else's camera and you manually focus that you need to adjust this first before shooting. Also, if you let someone else use your camera this would be a very important thing to check and reset before you start shooting again.