More OLAF lab work from Uncle Rog at LR:
https://www.lensrentals.com/blog/2018/02/mtf-testing-for-the-sigma-24-105mm-f4-dg-os-hsm-art-series-lens/
Of note:
"All lenses are sharper stopped down a stop or more. But the Sigma 24-105 sharpens up spectacularly at f/5.6. The truth is, after seeing this difference, I’d probably just plan on using this as an f/5.6 lens whenever I could. This is a much better improvement than the Canon 24-105 IS II makes stopped down to f/5.6."
See plot below. Stopping down always helps, but wow does it ever for this lens. He later went on to call it "This is the Best Damned 24-105mm f5.6 Lens Ever Made". ;D
- A
https://www.lensrentals.com/blog/2018/02/mtf-testing-for-the-sigma-24-105mm-f4-dg-os-hsm-art-series-lens/
Of note:
"All lenses are sharper stopped down a stop or more. But the Sigma 24-105 sharpens up spectacularly at f/5.6. The truth is, after seeing this difference, I’d probably just plan on using this as an f/5.6 lens whenever I could. This is a much better improvement than the Canon 24-105 IS II makes stopped down to f/5.6."
See plot below. Stopping down always helps, but wow does it ever for this lens. He later went on to call it "This is the Best Damned 24-105mm f5.6 Lens Ever Made". ;D
- A