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Old 11-26-2011, 03:25 AM
bichio's Avatar
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Default Lens sharpest level at two stop below minimum aperture?
Dear all,
People says that the lens have got their sharpest level at two stop below minimum aperture. I would like to now recognize my Canon one 55~250mm f4 but not sure as I am not major in this. It seems to me that it is at 135mm ~ f8, am I right?
Could you please help me?
Thank you in advance,
Bichio
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Old 11-26-2011, 04:31 AM
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The only way to know is to test it.
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Old 11-26-2011, 04:47 AM
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Looking at the ISO crops it appears that f/8 tends to be the sweet spot, at least for center sharpness.
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Old 11-28-2011, 09:36 PM
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Err... two stops below maximum aperture.

Smaller the number, the bigger the aperture.

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Old 11-28-2011, 11:14 PM
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Quote:
Originally Posted by Elmo View Post
The only way to know is to test it.
Agreed. Your lens may perform differently on your body compared to "average results"...but I'd bet f/8 is a good starting point.
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Old 12-12-2011, 03:16 AM
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Thank you for your advices. I will try.
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