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07/06/2005 09:21:32 PM · #1 |
| Question: Is sharpness becoming better along with F numbers going up? Does it have a peak? I thought at first that F10 was kind of the best sharpness you can obtain. But I saw someone in a picture talking about using F27 to get a better sharpness (I think)... |
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07/06/2005 09:28:34 PM · #2 |
Yes, it does peak. Depends on the lens as to exactly where best sharpness occurs. Typically the aperutre for peak sharpness is somewhere between f/5.6 and f/11. Above f/16, it's pretty likely things will get softer due to diffraction. For very sharp lenses, it may be impossible to tell much difference between f/4 and f/16, since the lens may be providing more detail than the sensor can capture.
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07/06/2005 09:30:31 PM · #3 |
OK, Thanks for the answer
JP |
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07/06/2005 10:28:38 PM · #4 |
Originally posted by darix:
Question: Is sharpness becoming better along with F numbers going up? Does it have a peak? I thought at first that F10 was kind of the best sharpness you can obtain. But I saw someone in a picture talking about using F27 to get a better sharpness (I think)... |
The person stopping down to f:27 was almost certainly doing it to increase depth of field. That is to say, to generate a greater zone of sharpness. Maximum sharpness in a given lens is almost always attained at an intermediate aperture, typically f:11 or so, but there can be an APPEARANCE of greater sharpness, especially in closeups, if more depth of field is brought into play.
Robt.
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07/06/2005 10:36:48 PM · #5 |
once again Kirbic nails it.
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