f-22 Night-time long exposure shooting


No longer a newbie, moving up!
Sep 19, 2012
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Istanbul, Turkey
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Can anyone tell me why some photographers choose to stop down to f-22 when doing long exposure photos at night rather than going for the "sweet spot" of their lens and dial in something like f-8 or f-11? Would f-22 ensure more depth of field or do they choose it in order to be able to use shorter exposure time? I've shot a couple of long exposure shots at both f-8 and f-22 using the same exposure and cannot see much of a change on screen.
Points of light will take on a behavior where they begin to look like stars IF you use a very tiny aperture. Obviously only at night or a sunset -- some time when you have "point" light sources that can create diffraction spikes.
I thought this was going to have pix of an F-22 flying at night/light painting. :(
Like TCampbell said. You can do stuff like this:

_DSC9121 by DiskoJoe, on Flickr

I intentionally shot this at f22 to get the exaggerated streaks from the lights. This is more exagerrated then some lenses will do since I shot this with my sigma 70-210 and it has a tendency to flare a lot already.
From my experience, the image is less sharp smaller than F11, while in theory, it should be more depth of field.
I now only shoot at max F 8 , or at sweet spot of F 5.6 ... depending on how many seconds the shuttertime will be. I don't like to wait long to see the result.
Damn shuttertimes of 30 seconds + 30 seconds waiting while doing the long exposure noise reduction process...
I missread the title, i was expecting some long exposure F-22 Raptor photo`s :blushing:

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