
Originally Posted by
VulgarDisplayCFH
How do you make the first pic so focused but so blurry in the background
That Wikpedia definition that DELETED linked to is very official and also pretty confusing. I'd read it but also let me have a try at a practical explanation.
If its a film camera and not on automatic, the match needle meter in the viewfinder selects a combo of shutter speed and lens opening that will give you a correct exposure. Every time you open the lens one click (stop) you must slow down the shutter speed one stop.
F4 @ 1/1000sec =
F5.6 @ 1/500sec =
F8 @ 1/250sec =
F16 @ 1/125sec
All of these combos give the same exposure except the F/16 will have a lot of focus in front and behind and the F/4 will not (like in that first shot you asked about). Faster shutter speed = more stopped action but less DOF or focus in front and behind. Slower shutter speed and smaller lens opening = more potential blur if handheld and more depth of field. So use a tripod if you are using a slow shutter speed.
If yours is digital you can go into the menu and select a portrait mode which should blur the background (and foreground) for you.........
Or you can do the same as in the film example by selecting shutter or aperture priority and making a setting to match your needs.
An example on my digital would be thus: I'm on automatic and when I focus I see in the viewfinder that the lens is set on F.4 (wide) and I have a 1/1000 sec shutter speed. I want more in focus than F4 gives so I set the camera to shutter priority and put it at 1/125 (3 stops slower) The lens closes down to F16 (narrow) and I get foreground/background more sharp........
I hope this helps and if I ####ed it up I hope that Lexx, Blix or someone will correct me quickly. Incidentally, you can look at the lens in a film camera from the front and see it tighten or stay wide if you press your depth-of-field button that's there. You also have depth-of-field lines on the lens that correspond to the distance so you'll know from where to where should be in focus. This is cool so you can preset your camera to be in focus from Xfeet to Xfeet and then you don't have to focus quickly but can concentrate on composition......
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