Equipment
Image Courtesy Sigma USA I generally do MTF testing on multiple copies of a given lens so that I can present the averages, look at sample variation, and stuff like that. I’m always aware that looking at any single copy of a lens, especially a zoom lens, gives only a limited prediction of how […]
Lenses and Optics
We’ve finished, mostly, our fairly long series of articles on SLR prime lens variation. We started with prime lenses for several reasons. They are much quicker (and quicker is a relative term here) to test than zooms. They are simpler lenses and we expected that meant they would have less variation. We learned a lot […]
Lenses and Optics
Brandon has accomplished much during his summer with us, including several things I never thought we’d be able to do. One of those things was measuring the MTF of supertelephoto lenses on our optical bench. A vertical bench just isn’t designed to handle the mass of those big lenses and technically isn’t supposed to be […]
Equipment
Teleconverter use and compatibility can easily get confusing. I’d like to shed some light on the subject for those looking to get more length out of their lenses without the extra weight or cost. Teleconverters can add versatility to your camera bag by giving you extra length and a variety of looks out of lenses […]
Lenses and Optics
We’re nearing the end of the Varation series for prime lenses. If you are joining in late, you may want to go back to the original article for an introduction into the methods used. Today will look at the short telephoto group, lenses ranging in focal length from 85mm to 150mm. We’ve also included a summary table of […]
