Hi, I would go with the f/2.8 aperture. Shooting a crop sensor in a dim theater I would really like more than f/4 to work with. Compare the 80d and 60d in high ISO on DXO mark. The improvement is not huge. The 24-70 is by all accounts a beautiful and sharp lens. On a budget you might consider
Costing $999, the Tokina 24-70mm f/2.8 isn’t cheap, but if it offers comparable image quality, it could represent great value compared to such own-brand options as the $1749 Canon EF 24-70mm f/2.8L II USM or the $1797 Nikon 24-70mm f/2.8G ED. We ran the Canon EF version of the Tokina 24-70mm f/2.8 though our industry-standard tests to see how Crop the Tamron at 180mm a little and your image will be sharper and more detailed than the Sony at 200 mm. 180 vs 200mm is so minimal difference. There is good YouTube videos on Tammy 180mm vs Sony 200mm. I'd take a 70-180mm at f/2.8 all day over a 70-200mm at f4. Wow, never knew its a bad lens, let alone one of the worse. The Tammy it is!
has a silent focus motor built into the lens. Sony FE 24-105mm f/4 G OSS. Tamron 17-28mm f/2.8 Di III RXD. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.
vs. Tamron SP 24-70 f/2.8 Di VC USD G2. vs. Canon EF 75-300mm F/4-5.6 III. vs. Canon EF 75-300mm F/4-5.6 III USM. vs. Canon EF 24-105mm F/4L IS USM. vs.
