Perfectly Frank wrote in post #17731482
I have 2 1DMKIV cameras that I use for air show photography. But even with long lenses there are times when I wish I had more MPs to crop from, or a longer lens.
For that reason I bought the 7DII. I figured it being 1.6x crop and having 4 more MPs than my 1D4 would be a benefit when shooting objects (planes) at a distance.
It certainly should be better than cropping the 1D4 more.
I used my 7DII at two air shows, with the 300 f2.8 IS II and the new 400 DO II, both with & without 1.4xIII and 2xIII extenders. I shot at various shutter speeds for both propeller planes and jets.
I found that my 7DII images were consistently softer than those from my 1D4. Not really bad, just a bit softer. Probably not a deal breaker for most users, but because I consider myself a sharpness freak, I prefer the 1D4.
At 100% pixel view, the 1D4 should have the potential to be sharper, but that's only because you're hiding what the 1D4 can deliver or fail to deliver, by keeping the magnification of the sensor area that a plane falls on lower. It's a game of illusion. With the same lens, subject, distance, shuter speed, and all else, bigger pixels will always look sharper and have more acuity in 100% pixel views, unless the bigger pixels have a significantly stronger AA filter than the smaller pixels, in which case, a 100% pixel view of the smaller pixels could be sharper.
Sharpness, however, is often an illusion, and is not necessarily subject detail.
I think the 7DII is a great camera. I like the AF area selection lever - a nice feature. But I like my two 1D4s better. They work better for me when panning aircraft in flight. In fact, the reason might be me. Maybe the smaller sensor size and more MPs requires better panning skills. I don't really know, I'm just speculating.
I doubt it, unless the 7D2 has more mirror slap visible at the shutter speed used, or it's AA filter is tremendously stronger. It's the illusory way of looking at the results, most likely. What do you see on your monitor when you upsample 100% crops from the 1D4 to 140%? That's what the 7D2 is really competing with in focal-length-limited situations.