The f/2.8 is a sharper lens than the f/4, especially in the middle of the focal length range around 50mm where the f/4 is at its weakest. Whether the f/4 lens is sharp enough at a significantly lower price is an individual decision. In terms of Minimum Focus Distance and Maximum Magnification the EF 24-70mm f/4 is more useful.
f/2.8. f/4. Vì có khác biệt về độ sâu trường ảnh do số f, hiệu ứng bokeh của ống kính f/2.8 là lớn hơn. Ngoài khu vực được phóng to, hiệu ứng bokeh ở tất cả những chỗ khác cũng có vẻ lớn hơn và mượt hơn một stop đối với ống kính f/2.8 so với ống kính f/4. Do đó
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24-70 f/4 vs 24-70 f/2.8 II. And it looks like the 24-70 f/4 is superior in a number of critical areas when mounted on a 1DXMKII.
The 24-70 f/4 L IS is really cheap right now. And the 24-70 f/2.8 while really nice still lacks the IS many of us would love to see. Since you already have the 24-105 f4, what would be the point of 24-70 f4? I decided to keep the 24-70 f2.8 for its unbeaten sharpness, since if I ever need that extra 35mm or IS, I can always go back to the 24-105
However, in fairness, the performance of 24-105mm f/4 tails off more noticeably past the 70mm limit of the 24-70mm f/2.8 lens. If we compare the same focal range (as we should), the new lens outperforms the 24-105mm between the crucial f/4 and f/8 range but it also performs very well at f/2.8. Map Sharpness at 50mm f/4 focal length: Tamron SP 70-200mm f/2.8 Di VC USD G2 Lens for Canon EF (confirmed) – Though in two cases needed to be micro adjusted Tamron SP 150-600mm f/5-6.3 Di VC USD G2 for Canon EF (Confirmed) Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens for Canon EF – We have seen both good and bad examples of it.
The first telephoto lens of choice, especially recommended for beginners, is the 135mm F2.5 SMC Pentax. This lens has the Pentax K bayonet mount, and requires the K-EOS adapter for attachment to Canon EOS cameras. When the aperture is stopped down to 37mm using step-down filter rings, this lens produces incredibly tiny pinpoint star images from
Canon RF 70-200mm F4 L IS USM Lens. 24.5. (695) 3.3 x 4.7. (83.5 x 119.0) 77. The F2.8 lens has a tripod mount ring, an advantage for rotating a camera mounted on a tripod or monopod, but the F4 lens isn't heavy enough to require such for balance purposes. The F4 lens has a modest maximum magnification advantage (0.28x vs. 0.23x). The one thing that annoys me about 24-70 lenses though, is that 70mm is just not in the sweet spot for a traditional portrait focal length. I just wish lens designers would push a little longer to 24-85mm whilst maintaining f2.8. On that basis, I'd go for the Sony, which at 105mm f4 would give similar equivalence as 85mm at f2.8. Den

The 24-120 is an easy pack one lens and go option. The 28-75 makes prettier portraits with the 2.8, despite being optically inferior. If I had to pick one though, it’s the 24-120. I’d get most of what we need and it’s a wonderful lens at every focal length. *I have the 50mm 1.8 and it is a brilliant lens.

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