f/3.5-5.6 or 1:3.5-5.6, where '3.5' and '5.6' refer to the maximum aperture for the short and long ends of the zoom range respectively. The smaller the f-number, the larger the aperture, allowing more light through to hit the sensor, while the higher f-numbers mean a smaller aperture, allowing less light through.ДЄll lenses have a maximum aperture, and on a NIKKOR lens you'll see this inscribed on the barrel e.g. The aperture is the opening in the lens's diaphragm through which light passes. But the key thing to remember is that the lower your f-number, the less depth of field and the blurrier the background the higher the f-number, the greater the depth of field and therefore the sharper the background. Another is how close you are to your subject. One is your camera's sensor вЂ“ an FX (full-frame) sensor will give you a shallower depth of field than a DX sensor at any given aperture. There are a few other parts to the equation.

You control the depth of field by altering the lens aperture.

With shallow depth of field, only a narrow section of the image looks sharp and everything else is blurred, while wide depth of field keeps everything in the picture acceptably sharp from front to back. Either way, what you're doing is playing around with depth of field.Дepth of field is the zone of acceptable sharpness around the point you choose to focus your image вЂ“ how sharp or blurred are the areas behind and in front of your subject. Do you want only part of your shot to be in focus, or all of it? If it's a landscape, 'all' is most likely your answer, but for portraits and wildlife, you might prefer to lose a distracting background.

Portrait bokeh aperture 3.5