What shutter speed do you need to avoid blurry landscape photos?

[@robertsaunders5740]

Thanks, I bought a 1970's Nikon 200mm Fi:4 lens and with an adaptor put it on my EOS DSLR body. I will be taking lots of test shots with note of the settings.

[@nickmalataverne5098]

Hmm, while I agree that slow shutter speeds can impact your landscape photography in certain cases, I have to disagree with your analysis here: with apertures down at 16, 20 or even 25 you are way into the area of diffraction on a Canon 80D.