![]() Also, the size of the pixels relative to the CoC can make distinguishing the focus point from other points indistinguishable precisely because you won't be able to view the focus plane any closer than that. The closer you look, the shallower the DOF becomes conversely, as you move further away the less distinguishable any differences in focus become and the DOF correspondingly increases in depth. ![]() ![]() Frankly, I don't see this being something I in any way need to be overly concerned about in my lifetime, and I know for a fact that we can get huge prints using FX/135 format at f/11 and not be "diffraction limited." In the perhaps not-so-distant future we may have camera sensors capable of showing practical diffraction limitations of our better lenses, perhaps when we reach 72 or 100 megapixels on 135/FX format sensors - we're already there with a lot of smartphones and other smaller formats - but even then we will be discussing enormous prints or significant crops (that would effectively put us back to working with tiny formats). Now if you can demonstrate otherwise then by all means do so. Our cameras don't record diffraction at f/4 and barely at f/5.6, and diffraction even at f/11 does not effect resolution enough to make it unrecoverable (as I demonstrated above). ![]() It's irrelevant to me because I'm not "diffraction limited" and neither are the vast majority of real world photographers circa 2021. Then we are no longer discussing diffraction.įor the rest, do read a good book on optics. Yes, your sensor's capability to record what a lens can offer may be limited. I actually had to take a step back because the D500 and Tokina macro lens was resolving all of the resolution bars (if I got closer still I would be resolving the ink dots, which I have done) and I actually wanted it to reach a point where it was no longer resolving a couple of the resolution bars. The fact is, you can't say what the limit of my lens is shooting at f/5.6 because the sensors I'm currently using don't show it.Īlso, as you can see from the crops on the left side where both files came out of the Raw converter using the same settings, there is an obvious difference between using f/5.6 and f/11, but it's acuity and not resolution. My sensor isn't good enough because my lens resolves to Nyquist frequency on my D500 (which is around 45 MP when scaled up to FX area). I call bull on my lens not being good enough to show diffraction at f/5.6 or probably even a wider aperture. Now, should you and i be glad that most of our lenses are not perfect? So there is nothing remarkable about diffraction limited lenses at f/11.Ī perfect lens will show that resolution halves with every two stops you close the aperture down. Only very bad lenses are still limited to less by lens faults at those apertures. The effect is so real and great, that most lenses are limited by diffraction at f/11 and stopped down more. ![]() Your lens' performance is not limited by diffraction, it is not diffraction limited, at f/5.6. But your lens' performance at f/5.6 isn't good enough to reveal it. I will grant you that going to f/22 I do lose about half the resolution, so (again) the theory may well be true, I'm not disputing that, but (again) in the real world circa 2021 f/11 works fine for shooting landscapes with very nearly no resolution loss compared to shooting at f/5.6 (or wider), at least for any lenses I have had the opportunity to use (the above being my first really good lens dating back to when I owned a Nikon D200, and still a really sharp lens to this day on my D500).Īgain, Tony, that you do not see an effect when stopping down from f/5.6 to f/11 means that resolution limiting effects of lens faults at f/5.6 are at least as great as that of diffraction at f/11.ĭiffraction is real, not hypothetical. Here is an example of what I see, the four crops on the left side being 100%, focused using Live View and shot on a solid tripod using MUP with EFCS: Besides that, I make up for softness from resulting diffraction by applying sharpening during post processing. in the real world I live in I don't see anything close to that and testing sites correlate with what I see, so nothing remotely close to losing half your resolution when stopping your lens down from f/5.6 to f/11. ![]()
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