Resolution of a 24-70 2.8L MKI on a Canon 6D

CheshireCat wrote in post #18079363
... so your answer to the OP's question is ?

That on a 6D the Nyquist limit is about 78 LP/mm for a monochromatic grayscale subject, and 39 LP/mm is where its at for absolute full colour resolution. I would not want to pass much more than 55 LP/mm to the sensor of the 6D. I am sure that the maximum resolution of the original 24-70 f/2.9 L is going to be plenty enough for the 6D sensor. Actually I think the max resolution of the lens will be perfectly adequate on the 7DII or 5DS, or even the new Canon 24 MP APS-C sensors. My previous post being the reason why!

Alan

Ok, so we agree that it is a good lens on the 6D

Though, I wouldn't be worried about "too many" LP/mm for several reasons:
- Moire issues, assuming the subject is problematic, can be easily fixed in post (at least for stills).
- The LP/mm performance of a lens is usually calculated wide open on axis, may widely vary in the rest of the frame, varies with focus distance, and is easily exceeded when stopping down the lens a bit. So it is quite impractical, if not impossible, to use LP/mm when trying to understand what the best lens for a sensor is.
- If you stop down the lens further, diffraction kicks in and acts as a natural tunable AA filter that "fixes" Moire (yes, diffraction can be useful sometime !).
- If one is really worried about Moire (some video shooters), there are AA filter mods for the 6D. And actually, one could have bought a different device in the first place.

Theory is all good however my experiences showed that the mk II versions of the 24-70 and 70-200 were much better for resolution of details on my 5D3 and 7d2. The 24-70 did better at the edges for group photos and also for cropping down for a tighter portrait, and the 70-200 was better at contrast and a bit better for detail overall. I enjoy the new versions. The optical recipe on both are better than the originals, and those differences can be seen in back to back comparisons.

TeamSpeed wrote in post #18079905
I enjoy the new versions. The optical recipe on both are better than the originals, and those differences can be seen in back to back comparisons.

Sure. It would be nonsense for Canon if they weren't better than the previous versions.
However, the v2 does not make the old v1 insufficient for the 6D sensor. It is just not as technically good as the v2.

I have had 4, and none were very technically good, especially wide open. The first gen is a bit notorious for that. The lens is after all nearly 2 decades old.