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Old Feb 20, 2012, 1:25 PM   #11
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if i put focal length 15mm and aperture f/20 into my dof calculater on my phone it gives a hyperfocal distance of 1.8ft
this should make everything from 1.6ft - infinity sharp
never tried it at night, but i dont see why it would be different
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Old Feb 20, 2012, 3:20 PM   #12
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It'll be in focus but at f20 at night it'll probably be all black as well.
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Old Feb 20, 2012, 7:30 PM   #13
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Quote:
Originally Posted by MartinSykes View Post
It'll be in focus but at f20 at night it'll probably be all black as well.
Agreed, but can't that be compensated for by using the Bulb setting and taking a lengthened exposure?
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Old Feb 20, 2012, 9:58 PM   #14
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Using long exposures tends to increase noise, which will make your picture less than sharp. Also, things tend to move around a bit outdoors, so vegetation especially will be blurred from motion. Your tripod may also move a little if it isn't on a really solid foundation, or if you move around during the exposure, or jiggle the remote cable, etc. Your lens may not be very sharp at f/20, either. There are those who claim that diffraction limits sharpness at small apertures, depending in part on pixel size. Taken all together, the best bet would be a faster shutter speed and wider aperture.

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Old Feb 22, 2012, 2:20 PM   #15
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Quote:
Originally Posted by MartinSykes View Post
It'll be in focus but at f20 at night it'll probably be all black as well.
the op is using f18-f22 now and his pictures are not black, just out of focus

can you post some examples quadna?
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Old Feb 22, 2012, 2:56 PM   #16
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I can't right now...but hopefully by the end of this week I'll have access to my computer.
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