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DPChallenge Forums >> Tips, Tricks, and Q&A >> Use 1 stop narrower than wide open as default?
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Showing posts 1 - 11 of 11, (reverse)
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07/16/2007 04:28:29 PM · #1
From what I've read, it seems like lenses generally are sharper a stop down from maximum aperture. Is that accurate?

So for DOF, for example, it seems like I should check it wide open and 1 stop down and if the DOF is acceptable 1 stop down, I'm likely to get sharper results there.

Same would go for shutter speed - if I'm happy with the shutter speed I get one stop down from max aperture, I should go with it.

Of course, in situations where I want deep DOF (e.g., landscapes) or some blur, widest aperture isn't relevant.

Is that a good approach?
07/16/2007 04:49:20 PM · #2
Lenses are generally sharper more toward the middle of their stop range. If you have a prime, then usually the 1stop thing will work, but for zooms there's a smaller window of exceptional sharpness depending on the lens. Doesn't mean you can't get good sharpness at 1-stop or even wide open, just not exceptional.

I'd say shoot what gives you the right light first, and worry about sharpness second.
07/16/2007 05:16:20 PM · #3
Yep, in a nutshell, the closer you get to f8 the sharper from either direction.
07/16/2007 06:16:58 PM · #4
Originally posted by jackal9:

Yep, in a nutshell, the closer you get to f8 the sharper from either direction.


Depends on the lens. Some are best at 8, some 10, some 12...
07/16/2007 07:39:06 PM · #5
Originally posted by chimericvisions:

Originally posted by jackal9:

Yep, in a nutshell, the closer you get to f8 the sharper from either direction.


Depends on the lens. Some are best at 8, some 10, some 12...


I got to thinking about that afterwards, I suppose it would depend on what the widest apt. setting is for each lens? like an f5.6 to f22 might be sharpest at say f11? Am I correct in that assumption? As wavelenth stated near the middle apt. setting.
07/16/2007 09:49:09 PM · #6
The general rule of thumb for 'sharpness' in any give lens is two stops from wide open.
07/16/2007 10:14:40 PM · #7
Originally posted by jmsetzler:

The general rule of thumb for 'sharpness' in any give lens is two stops from wide open.


What he said...

R.
07/16/2007 10:34:49 PM · #8
Originally posted by Bear_Music:

Originally posted by jmsetzler:

The general rule of thumb for 'sharpness' in any give lens is two stops from wide open.


What he said...

R.

Cool, thanks guys! Didn't mean to "Jack" your thread Jeffrey!! LOL. Proceed...
07/16/2007 10:42:41 PM · #9
No, Jack, that's exactly what I was looking for. Thanks, everyone!
07/16/2007 10:49:31 PM · #10
Just go "L" and don't worry about it.
07/16/2007 10:58:03 PM · #11
Originally posted by TJinGuy:

Just go "L" and don't worry about it.


L lenses are also generally sharpest at 2 stops from wide open, just like any other lenses.
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