A stupid question: sharpness/resolution vs focus

Started Nov 27, 2005 | Discussions thread
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Gediminas 8 Senior Member • Posts: 1,133
A stupid question: sharpness/resolution vs focus

Hello,

while many lenses are considered to be their sharpest at f/8-11, others are said to be better at different F numbers due to the effect of diffraction. For example, the EF-S 10-22 is said to deliver the highest resolution at something like f/4.5.

However, I have difficulties reconciling this with the fact that any serious landscape photography is done with lenses stopped down to f/16 or even f/22 so as to get in focus as much of the image as possible.

Are folks who use tripods and such small apertures sacrificing image sharpness for the sake of DOF, ie focus? Should they be using their wide-angle lenses at f/4.5 and the like and leave their tripods at home?

And - a silly question perhaps - what's the difference between a "focused" and "sharp" part of an image then?

Enlightenment would be appreciated:)

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Starting a gallery of my country:
http://www.pbase.com/lithuania/images01

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