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<blockquote data-quote="stmv" data-source="post: 105072" data-attributes="member: 10038">the small aperature allows greater DOF, but as stated less light, and less exposure. every full Fstop is 1/4 smaller, every half Fstop is 1/2 smaller, which is why Cameras make the fstop openings in 1/2 steps, so each click (ok,, I am old fashion),, I mean spin of dial, changes the fstop by 1/2 and needs approx twice as much light for the same exposure. Also, the sweet spot of a lens for sharpness tends to be from F5.6 - F11 or so.. for absolute sharpness. Yes, there is time to use F22,&nbsp; like when on a tripod, and you are trying to make that waterfall oh so creamy. just like there are times you want maximum aperature opening like F2.8 or if you have a faster lens, 1.8, or more expensive even faster. 1.4,, or for chuckles 1.2, for that really narrow DOF, but really creamy background.DOF -&gt; depth of field,,&nbsp; think of it as this band front of the object and back of the object that is in focus.</blockquote>

[QUOTE="stmv, post: 105072, member: 10038"] the small aperature allows greater DOF, but as stated less light, and less exposure. every full Fstop is 1/4 smaller, every half Fstop is 1/2 smaller, which is why Cameras make the fstop openings in 1/2 steps, so each click (ok,, I am old fashion),, I mean spin of dial, changes the fstop by 1/2 and needs approx twice as much light for the same exposure. Also, the sweet spot of a lens for sharpness tends to be from F5.6 - F11 or so.. for absolute sharpness. Yes, there is time to use F22, like when on a tripod, and you are trying to make that waterfall oh so creamy. just like there are times you want maximum aperature opening like F2.8 or if you have a faster lens, 1.8, or more expensive even faster. 1.4,, or for chuckles 1.2, for that really narrow DOF, but really creamy background. DOF -> depth of field,, think of it as this band front of the object and back of the object that is in focus. [/QUOTE]

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