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Gene Murray

Depth of Area - What it is and How to Management It - 0 views

depth of field DOF landscape macro hyperfocal distance telephoto lens wide angle sharp

started by Gene Murray on 19 Feb 12
  • Gene Murray
     
    Depth of field (DOF) is the amount of your photograph that is acceptably sharp. If you concentrate on a barn, a specific sum of the industry in front of, and driving, the barn will also be in concentrate. For instance, it could be every thing amongst 6 ft and 8 ft from the digital camera, or every little thing from thirty ft to infinity. ("Infinity" implies "so far absent that farther doesn't make any difference.") The depth is dependent on 3 items: the length in between the matter and the lens the focal duration of the lens and the aperture setting.

    1. The distance among the topic and the lens- The farther the subject is from the lens, the better the depth of field. It's, a lot simpler to get a excellent depth of area in a landscape photograph than a macro shot. Utilizing my 50mm lens at f/sixteen, I can get every thing sharp from eight ft (two.four m) to infinity, or from 16" (.four m) to 18 ft to m. This tends to make concentrating for a macro shot very difficult.

    2. The aperture- The narrower the aperture, the increased the depth of field. That exact same fifty mm lens at f/8 will get almost everything sharp from 16.five ft (5 m) to infinity. At f/4, just 33 ft (10 m) to infinity. So if you use a extensive aperture and focus on the mountains, the foreground is out of focus. This is why so numerous landscape photographers use small apertures. Of study course then you need to have a slower shutter velocity to compensate, and you are likely to require a tripod.

    3. The focal duration of the lens- For the very same camera-to-matter length, a telephoto lens will have a shallower depth of subject than a vast angle. My 28 mm lens at f/ sixteen will target sharply from 10 ft to infinity, which offers as great a depth of field as the fifty mm lens at f/eleven. That's a massive support in low light. On the other hand, a 200 mm lens, even at f/32, will only emphasis from 32 feet to meters. the best you can do by way of foreground will be colored blotches


    In the days of film cameras, SLR lenses would have depth of field guides on them. These days, most lenses really don't, which is a shame, simply because they're quite helpful.

    If you are trying to get the total of a deep item in target, for example the popular indicator at Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch train station in Wales, you should concentrate a third of the way into it.

    The hyperfocal distance

    For landscape photography, you obviously want distant objects like mountains to be sharp. The obvious thing to do is to concentrate on infinity. But that indicates that 50 % your depth of subject is "behind" infinity and squandered. You want to concentrate so that the far edge of your depth of field is at infinity. This point is so beneficial that it is received a special identify -- the hyperfocal distance.

    If you have a lens with the depth of subject markings, it's straightforward. You can just set the infinity symbol on the mark for your aperture. Actually, you will do greater to target on your foreground interest, notice the distance, and uncover the aperture which provides a DOF from there to infinity.

    If your lens isn't going to have this, there are numerous DOF calculators on-line, some that run underneath windows or Mac, and and at least one iPhone app. Considering that you might not have Web access halfway up a mountain, I suggest you make a notice of the hyperfocal length at numerous focal lengths and apertures and maintain it in your kit bag.

    This could consider apply, but as soon as you learn depth of field, you will have full control about just how significantly of your photograph is sharp enough to draw the viewer's eye.

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