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Category » Lenses and Optics

MTF Charts for 24mm Lenses

Equipment

Practical Use of Field Curvature: Wide and Telephoto Primes

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We introduced evaluating field curvature with 35mm f/1.4 lenses, then looked at how those differ from slower 35mm primes and zooms at the same focal lengths. Then we got into some practical stuff, showing how field curvature gives you useful information for 50mm lenses. Today we’re going to look at 24mm and 85mm prime lenses for a couple of […]

Equipment

Finally, the Nikon Z 24-70mm f/2.8 S Lens Teardown

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Just so you know, my original title was “Lens Disassembly is a Complicated Profession. Don’t You Agree?” The editor said nobody would know what the post was about. But I promise, you’ll see by the end of this; lens disassembly is a complicated profession. We were interested in this disassembly, and by interested, I mean both […]

Lenses and Optics

Practical Use of Field Curvature Graphs – the 50mm Primes

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In my last two posts (1,2), I’ve been using field curvature graphs to look at how lenses behave as you stop them down. It’s been a fairly limited data set; basically 35mm prime lenses and some zooms at 35mm. I’m going to keep going with this topic and today look at a different focal length […]

Stopping down Lens

Geek Articles

Things You Don’t Know About Stopping Down Your Lens

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Warning: This is a somewhat Geeky article. It has some real points that are useful for anyone who uses lenses, though, so I’ve tried to keep it mostly in English.  In imaging, there are a lot of topics where people over-generalize; there’s a general tendency for something to happen, but people become convinced that the […]

Sigma 35mm f/1.2 MTF Charts

Lenses and Optics

MTF Tests of the Sigma 35mm f/1.2 DG Art

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We just finished testing a couple of 35mm prime lenses and came away quite impressed. But it took a little longer to finish testing the one everyone had been asking about; the Sigma 35mm f/1.2 DG Art lens. I declared the Tamron 35mm f/1.4 SP the sharpest 35mm lens we had tested just a week […]

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