[quote=That_Look_Photo]How does one find the sweet spot of a lens ? I have not been able to see any real difference .
Mike
In general and in most cases it's usually two stops from the widest aperture point. For instance, a 2.8 lens would have a sweet spot at 5.6.
In lamen terms and in some cases shooting wide open on lenses you might have a strong center sharp area while the edges start to go soft. You will find this a lot more often in your cheap chimpy bimbo lenses, but even expensive lenses might depart from sharp from center, top and bottom sharpness. Therefore when it comes together at the lens's optimum aperture you will have the "sweet spot" while in control of dof.
Now take that into consideration and then you have focal length to factor in on various zoom lenses. For instance, an 80-200 at 80 mm might have a sweet spot that is different then at 200. Also variable aperture zoom lenses will obviously be different as well.
J T
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