5D MkIV vs 7D MkII resolution

Not sure if there is an actual math equation to figure this out and to be honest I've had a couple beers tonight so I probably couldn't figure it out anyway, but can anyone tell me given the same framing (cropping the 5DIV) which camera would yield a higher resolution photo? Trying to decide if it would make more sense to run a 5D3 and a 7D2 or just stick with my 5DIV. I do shoot a fair amount of sports, wildlife and airshows but the 5DIV FPS is sufficient (albeit slower than the 7DII) so that's not really a concern. More so just trying to figure out if I'm losing much "reach" using the 30MP FF vs 20MP crop. I do still want a great camera for low light though so that's why I'm considering both. I had the 7dII before and was very happy with the results in decent lighting, but as expected not ideal for low light or higher ISO. In my head I'm thinking 50% more pixels should be able to be cropped to FOV of a 1.6 crop 20MP camera and have almost the same resolution???

i believe that a crop from the 5DIV would give you just under 12MP - 30MP/(1.6x1.6). So, that would be a 40% reduction in the number of pixels on target when compared to the 7D2.

5DIV starts with 6720 x 3840
7DII starts with 5472 x 3648

Take a photo with a lens on 5DIV, and then crop the 5DIV down its size to APS-C size by cutting off approx. 9mm vertically and 13.5mm horizontally, and end up with about 15mm x 22.5mm image (APS-C), that leaves about 4200 x 2400 pixels.

You would certain be better off using the same lens on the 7DII!

To beat the resolution of the 7DII would require a FF sensor which has more than 8755 x 5837 pixels!

Thank you for the breakdown. That's a pretty significant reduction. Much more than my brain was trying to calculate. I'll have to pick up the 7D2 again and go back to the 5D3. 5D4 for my use solely on low light shots would be overkill given the capability of the 5D3 and the $1000 difference picking up a used model and selling the 5D4.

FWIW in a full frame body the 5DS/5DSR with 50mp have more or less the same resolution / pixel density as the 7DII.

However, for those that have a 1D4, a 1.3 APS-H crop from a 5D4 yields a higher resolution final result. The 5D4 has a mini 1D4 hidden away inside it.

graham121 wrote in post #18368942
FWIW in a full frame body the 5DS/5DSR with 50mp have more or less the same resolution / pixel density as the 7DII.

Exactly, and just to put MP on the numbers, the 5D4's 30 MP puts almost 12 MP into the same sensor size as the 7D2.

TeamSpeed wrote in post #18369331
However, for those that have a 1D4, a 1.3 APS-H crop from a 5D4 yields a higher resolution final result. The 5D4 has a mini 1D4 hidden away inside it.

Indeed, about 18MP

To see which body cropped to what smaller format is 'higher resolution', one does not need to engage in the gymnastics that I used for my earlier post in this thread...simply look at the pixel/millimeter number, the higher number wins!

Aw c'mon wilt, you left out the sensor with the fattest pixels ever! Where's the 1D?

CyberDyneSystems wrote in post #18369428
Aw c'mon wilt, you left out the sensor with the fattest pixels ever! Where's the 1D?

In the reliqary, where it belongs, close to the ashes of Louis Daguerre

I don't see my 10D on that list?

TeamSpeed wrote in post #18369610
I don't see my 10D on that list?

Sorry, my mind dismisses digital cameras below a certain standard, and if a dSLR has less than 8Mpixels, it never existed.

So it's a simple 12MP vs 20MP. 20MP must be better right?
Using the same logic a 16MP 1D4 (1.3crop) would be better than an 18MP 1DX (Full frame). Crop the 1DX to 1.3 only leaves 10.7MP.

Ari Hazeghi wrote an article for that comparison (1DX vs 1D4). Specifically as the 1D4 was the last of the crop 1D series so for many shooters who use long lenses, the 1DX seemed a poor choice over the 1D4. What he concluded was that at base ISO (100) the 1D4 does have an advantage.
However as the ISO increases the 1DX has an advantage due to less noise, despite far fewer 'pixels on target'. It's an interesting article as there seemed to be a rare consensus of other photographers that the conclusions were correct. Some believed it was not until ISO 1600 or 3200 that the 1DX won the battle, others believed this occurred at lower ISO, as low as 400. This was before taking into account that the 1DX AF was superior providing a higher 'keeper rate'.

Back to the 5D4 vs 7D2, the 5D4 has better AF and in some cases much better AF. (All points at F8, faster AF with some lenses and V3 TCs).
The sensor has a clear advantage with regards to shadow detail. Someone with both bodies will probably do some testing and it would not surprise me that results will be similar to the 1D4 vs 1DX comparison.

I have both bodies and without doing any specific testing but just from gut feel i agree with you totally.

Anything over about 800 ISO or so and I feel a cropped 5D4 image can resolve more detail than a native 7D2 image.

One thing I have found however is that the 7D2 appears to handle shadow detail better than the 1D4,