If you wanted to maintain constant exposure image brightness , while changing the f-stop values, then changes in ISO or shutter speed would have to be made in the opposite direction. The amount of light exposed to the image sensor is determined by the square area of the aperture as seen in the graphic below. I prefer to control this focus point manually, using back button focus.
By selecting the correct focal point location and f-stop settings, the photographer controls the depth of field for each image. The following examples show different image attributes correlate to varying f-stop values and depth of field. In this case, we will look at visual image attributes determined by f-stop, providing varying depths of field. Using this f-stop during the day requires a very fast shutter speed making it great for action shots.
The following image is in sharp focus for the person, but slightly out of focus for the background. To compensate for these decreases in DOF the photographer can increase f-stop values or use methods such as focus stacking.
All of the information above provides the foundation for selecting the best camera settings using the Photography Exposure Triangle. First learn the main 3 settings, f-stop, shutter speed , and ISO. Then continue on to the Photography Exposure Triangle Guide , for complete details on combining all of the settings. You can update your preferences or unsubscribe any time. Search Articles. Glossary Off On. What is Lens Focal Length Focal length, usually represented in millimeters mm , is the basic description of a photographic lens.
Standard Lens FX format approx. Telephoto Lens FX format approx. Super Telephoto Lens FX format approx. More Like This More articles like this. Article Collections. Articles like this, right in your inbox.
First Name required. Last Name required. Email required. Popular Topics. More from Nikon. Thanks Hakon for valuable information. I really appreciate your suggestion.
Wikipedia f number says: In optics, the f-number sometimes called focal ratio, f-ratio, f-stop, or relative aperture 1 of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; in simpler terms, the f-number is the focal length divided by the "effective" aperture diameter. It is a dimensionless number that is a quantitative measure of lens speed, an important concept in photography.
Whilst what you have posted may technically be correct I am -1'ing it as the original poster is asking some very basic questions and I think you will be totally blinding him with science. Heck, I've been playing with cameras for 25 years and consider that I know about exposures, yet what you have written is beyond me too I'm not saying this is a wrong answer, just to judge your audience a little better.
No offence. Mike - Sabres at dawn. Or cream cakes. My second will call. Please advise address for service. Not sure exactly what you mean by that, but I see you've edited it since I commented. Lovely pic of that Canon with the 0. Show 1 more comment. Chris Wuestefeld Chris Wuestefeld 2 2 silver badges 7 7 bronze badges. This was kinda cool. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
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