Diffraction visible at f5.6 with 20 MP

[Dave in Wales]

https://www.photopills.com/calculato...20Pixel%20size.

[Phill D]

Sorry I'm not sure I follow this fully. I didn't realise there were two diffraction options one for print and one for 100% crop, F11 vs f5.6, quite a difference? Surely the point at which diffraction occurs is fixed by Physics so isn't the print one saying that visually diffraction even though it's there by f5.6 isn't actually noticeable with our eyes in normal viewing until f11? So pondering this a bit more as I do tend to crop my images 10-20% occasionally then maybe the noticeable diffraction limit for me would drop a bit say to f8? Interestingly f8 is my usually used smallest aperture, rarely do I venture to f11 and almost never beyond that. Luckily, I guess, as light is usually in short supply I'm well below f8!

[pdk42]

Diffraction just causes loss of sharpness. Whether that matters will depend on viewing size. Personally, I reckon that even at f8, it's barely visible. I use f11 often with my 8mm FE to get sun stars and even at that aperture it's plenty sharp enough.

[Graham_of_Rainham]

It’s also very dependent on the wavelength of the light, but who needs sharp sunsets.