LFingar wrote:
...The 7DII has more AF points, 65 vs 45, but, the 90D has 27 points that will focus at f/8 vs 5 for the 7DII. If you ever plan to use a 1.4x extender on your 100-400 that can make a big difference. The 90D has over 50% more megapixels and appears capable of handling high ISO better. Part of that is no doubt due to the Digic 8 processor which, according to articles I have read, can outperform the dual Digic 6 processors of the 7DII. It seems that pretty much any capability of the 7DII has been matched or exceeded by the 90D. Not all, of course, but certainly enough to make it my choice. If you haven't done so already I suggest you visit the Canon USA website and do an in-depth comparison of the two. Even though it is no longer being produced I'm pretty sure the 7DII is still listed on their site.
...The 7DII has more AF points, 65 vs 45, but, the... (
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Just to clarify, assuming the 90D's 45-point AF system is the same as or very similar to what's in the 80D, 6D Mk II, etc... and it appears to be... it will "focus at f/8" at 27 of the AF points ONLY with a few, specific lens/teleconverter combinations... the EF 100-400mm II lens and the EF 1.4X III TC being one combo that works that way. Some other lenses and other TCs will not be able to use as many AF points. In many cases it will only be able to AF with the center AF point alone.
But, the 7D Mk II ALSO is only able to AF "at f/8" with the center AF point alone. It doesn't have five AF points capable of that.
Other differences in the AF systems include that the 7DII has more "focus patterns". Both cameras have Single Point/Manual, All Points/Auto (all Canon DSLRs have those), Large Zone, Small Zone and Spot Single Point (higher precision AF... which I think the 80D lacked). The 7DII also has 4-point Expansion and 8-point Expansion (both of which I use more frequently than the two Zone patterns). The difference between Zone and Expansion patterns is that Zones are just like a scaled down version of All Points/Auto (sort of a "point n shoot" mode). You leave it up to the camera to choose the AF points within the zone you've set up. It will usually choose the active AF point covering the closest object (which can be a problem, if, for example, you are photographing a bird flying past... it may well focus on the closer wing tip rather than the bird's body). With Expansion, on the other hand, the photographer chooses the AF point the camera should use, but if they have a difficult time keeping that "on target", such as due to fast or erratic subject movement, the camera has the option to switch to one of the adjacent AF points. This works well for sports, wildlife and other subjects.
7DII also has dual memory card slots (one CF, one SD). The 90D only has a single one (SD).
Although both can handle long bursts of shots at high frame rates, 7DII can buffer more images (probably due to smaller file sizes, not due to smaller buffer size).
7DII has magnesium body panels where the 90D uses plastic. The 7DII also has a more sealing for dust/weather resistance and a higher durability rated shutter (200,000 actuations). 90D's shutter is rated for either 100,000 or 150,000 "clicks" (I've seen conflicting info from unofficial sources).
7DII has 100% viewfinder with 1.0X magnification, slightly larger than than the 90D's 100% and 0.95X magnification.
7DII's battery grip has a secondary "joystick" and AF pattern selector, which allows the same control in vertical orientation as you have in horizontal (much like the 5D Mark IV's and a couple other models' grips have.) The 90D uses the same battery grip as the 70D and 80D, which lacks those controls. With them you have to move your hand back to the horizontal grip to make changes to the AF selections, unless you have a really long thumb!
Don't get me wrong. 90D appears to be quite a camera... It looks like it will be a super nice upgrade from the 80D in many ways. But it's definitely not a "7D Mark III". It would be interesting to see the performance possible with a 7DIII, were Canon to make one with the dual Digic 8 processors AND a discrete AF chip (like the 7DII and 7D used, but besides those two, only found on the 1D/1Ds/1DX-series cameras). I doubt all that processing power would make for much higher frame rates... there's a physical limit to how fast a mechanical shutter and the mirror mechanism of a DSLR can operate. But, who knows... maybe Canon has some tricks up their sleeve!
https://cameradecision.com/compare/Canon-EOS-90D-vs-Canon-EOS-7D-Mark-IIhttps://www.digitalcameraworld.com/news/canon-eos-90d-vs-eos-80d-vs-eos-7d-mark-ii-12-key-differences-to-be-aware-ofhttps://www.imaging-resource.com/cameras/canon/7d-mark-ii/vs/canon/90d/