Equipment
When the Canon 100-400 f/4-5.6 IS L Mk II lens was first released we immediately did some testing. First we took one apart and were extremely impressed with the build quality. Then we compared it using Imatest to the original Canon 100-400 IS L and the new Canon 400mm DO L IS Mk II lenses […]
Lenses and Optics
I was pretty excited when I first heard about the Rokinon Xeen line of Cinema lenses. For several years now, Samyang / Rokinon photography lenses have given photographers with reasonable expectations some superb alternatives. They sell optically excellent lenses at amazingly low prices. There are compromises made to accomplish this goal, of course, but they […]
Equipment
We’ve spent most of the last month establishing a database of MTF curves and expected copy-to-copy variation for a number of lenses. Most people have a general idea about what we’re doing, can follow along the basics of MTF curves, etc. But many other people also have a very good question, “How much of a […]
Lenses and Optics
Finally, the last in our series of MTF and variation tests is here. We’ll be doing these going forward as new lenses are released but for now we’ve got a nice database of common lenses that we can measure others against. We’ve completed almost all of the common prime lenses, along with wide and standard […]
Lenses and Optics
We recently published the MTF and variation curves of standard range lenses and now are going to tackle wide-angle zooms. As we’ve seen, zooms have more variation than primes and wide-angle primes have more variation than standard range primes. Also, the MTF curves of wide-angle primes are weaker off-axis than standard range primes. So my […]
