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In Reply to: DOF Illustration posted by pictureguy on June 30, 2020 at 15:30:33:
DoF describes the part of the photo that is IN focus. Narrow DoF means, of course, just a slice of the image is in focus, like your thistle blossom. Wide DoF means a lot of the scene, or the entire scene, is in focus. A lot of landscape guys are obsessed by having everything foreground to background in focus - like Ansel Adams and the f64 group. (I'm not sure how f64 on those large format cameras translates to modern DSLR or crop sensor digital cams.) As you've mentioned, I think, small apertures like f22 can cause diffraction from the light entering through a small opening. That leads to softness in the image.
On the other end, a wide opening ( like apertures 1.8 and larger), gives that narrow DoF and can have nice background blur - bokeh - but most lenses, wide open, are also often too soft on the image or show other flaws, like chromatic aberration o r vignetting. The solution is usually 'spend more money on better glass'. Even a lens that doesn't open wide can produce nice bokeh. It helps if the subject is separated from the background, so the background is some distance behind the subject. I have some f4 lenses that do a nice job with background blur, example below. The pipevine swallowtail butterfly and the foreground flowers are pretty sharp, but the background is pretty creamy. That was a Olympus 300mm lens, wide open at f4.
Bokeh isn't the same as DoF. Some lenses are prized for having beautiful bokeh, since there is such a thing as ugly bokeh. It's the so-called quality of the blur that's important. Smooth, silky bokeh is what's desired, as opposed to jaggy or busy. There are a lot of photo websites featuring beautiful bokeh. I'll link one, below.
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Follow Ups
- Bokeh and DoF - stan2 09:58:17 07/01/20 (1)
- RE: Bokeh and DoF - pictureguy 10:56:12 07/01/20 (0)
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