Nikon 35-70mm f / 2.8D AF Zoom-Nikkor photo. The aperture is fully working with 2.8 and this is not a joke. Sharpness at F / 2.8 on any focal, even the most extreme, is quite satisfactory (keep in mind that I work with it on DX cameras). At 70 mm and F / 2.8 it gives excellent portrait shots.

At 35mm I threw in the 35mm f/2.8 AI manual-focus (1979-1981), which only cost me $25 used. At 50mm I threw in the current 50mm f/1.8 D (2002 - ) so you can see how well a $110 non-zoom works against these expensive pro zooms. At 70mm I threw in the awful 35-70mm f/3.3-4.5 AF so you can see how good all these other lenses really are by comparison. A fixed aperture zoom has to change the absolute aperture size as the focal length changes. At 70mm f/2.8 requires a 25mm aperture, at 24mm f/2.8 requires an 8.6mm aperture. The Nikon does this mechanically. As you can see in the images below, as you move the zoom back from 70mm, the secondary aperture closes.

Recommended Read Thom's Full Review of the Nikon 24-70mm f/2.8 Lens. Coverage: (full frame (FX) Build: dust and drip resistant, S-line. Optic design: 17 elements in 15 groups. 2 aspherical, 4 ED elements. Arneo, Nano and fluorine coatings. 34-84 degree angle of view.

The Sigma Art series 24-70mm f/2.8 lens’s overall score of 31 on the Nikon D810 puts it 5 points behind the maker’s 24-35mm f/2, which is a noticeable margin. We expected the new lens to be closer. The two main third-party rivals from Tokina and Tamron share a similar overall level of optical quality, with the former boasting marginally
Set to be released early in 2022, the Nikon 28-75mm F2.8 will cost just US$1195. That’s almost half as much as the pro-grade Nikon Z 24-70 mm F2.8. However, the Nikon 28-75mm F/2.8 suffers some heavy competition. Despite its smaller F4 aperture, the nano-coated Nikon 24-70 mm F4 is cheaper, more compact, and possesses a wider angle of view.
Verdict. The Nikon Z 24-120mm f/4 S fills a small gap in Nikon’s line-up of Z-mount standard zoom lenses, slotting in between the more compact Z 24-70mm f/4 S and hefty Z 24-70mm f/2.8 S ‘trinity’ zoom. It’s sure to find favor with Nikon photographers shifting to mirrorless from a full-frame DSLR, who have long enjoyed the versatile 5x
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    • nikkor 24 70mm f2 8 review