This particular lens, the Nikon 135 f/2 DC, actually gives you the ability to fiddle with the quality of the out-of-focus areas with a separate Defocus Control ring (hence the DC). This doesn't affect DOF, but it does affect the appearance of the out-of-focus stuff. In this case, the DC was set for f/2, Rear. 3. Changing the lens' aperture. The final way that we can change our DOF is with the lens' aperture. By stopping down the aperture, you are physically blocking the light rays that are coming from A long focal length is probably the easiest way to achieve a shallow depth of field in a landscape. Just choose a foreground object and a large aperture; Use f/2.8 if available. For focal lengths

An important concept in microscopy is the depth of field, and the depth of focus, which are two related principles that are often interchangeably used. Both of these things have to do with the range of distance where the image is clear and in focus. The depth of field is inversely proportional to the numerical aperture of the objective lens

A wide angle lens will have greater depth of field than a normal or telephoto lens at any given aperture. On any lens, the smaller the aperture, the greater the depth of field. So, for example, a 24mm lens at f/8 will have a much larger potential depth of field than a 70mm lens at f/8, assuming they’re both focused on the same point.
Increasing depth of field for sharpness: Small aperture (make it smaller by increasing f-number) Move away from the subject by increasing the viewing distance; Use a lens with a shorter focal length; Decreasing depth of field for blur: Widen the aperture (make it bigger by decreasing the f-number) Move closer to the subject (i.e. closer
For wildlife or portraits, you should be fine pretty much wide open on a normal lens - about f/4-f/5.6 should be fine. If depth of field isn't a major issue, say if your subject is against a wall or multiple subjects are all at the same distance from the camera, a general aperture of f/8-f/11 should be fine. For situations like you describe in Mid-Wide Apertures: f/2.8-f/5.6. Mid Apertures: f/5.6-f/11. Mid-Narrow Apertures: f/11-f/18. Narrow Apertures: f/18-f/32. Aperture, along with shutter speed and ISO, is one of the three most important settings you control when you take a photo. It affects both the amount of light that hits your camera sensor and the depth of field of your images. 7rbVg7.
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    • how to do depth of field