Technical Discussions
OK, when I introduced our new optical bench, I mentioned that it generates a lot of data. We gathered data for a nice comparison test (I mean who wouldn’t want to know how the Zeiss Otus and Sigma 50mm f/1.4 Art stack up against some nice Leica 50mm lenses). Since then I’ve spent about 20 […]
Other
Note: This is a Geek article. If you aren’t into geeky stuff, you won’t be into this. “We take a step back so that we may leap further.” African proverb I wrote a post a couple of weeks ago about our first copies of the Sigma 50mm Art lens, and promised to follow up when […]
Lenses and Optics
This post contains absolutely no mathematics. Explaining MTF without math is sort of like doing a high-wire act without a net. It’s dangerous, but for any number of reasons is more likely to keep the audience interested. Why Am I Doing This Again? I wrote an article on reading MTF charts several years ago. It […]
Other
I suspect I’ll never be on any manufacturer’s “early review copy” list for new lenses. There are already plenty of good early lab reviews on the eagerly awaited Sigma 50mm f/1.4 Art lens at SLRGear, Lenstip, and DPReview, among others. So when we received our first Sigma 50 f/1.4 Art lenses for rental stock I […]
Lenses and Optics
We all know that aberrations affect points of light off-center, making them blurred. We all know that some aberrations are worse the farther away from center we go. And we know that some aberrations are improved when we reduce the aperture. Some of us even know the various rules-of-thumb for what makes an aberration […]
