There's something to be said about OEM lenses with full compatibility, native mount support, and a high level of quality control. That all comes with a cost attached. Then there are third-party manufacturers: companies that often offer the same level of compatibility, quality control, and multiple lens mount options, but many don't carry a price tag as high as the original manufacturers'. So today, we have John and Bill, joined by Mario and Brian, to discuss all things third party, from classic Tokina, Tamron, and Sigma. Modern options from TTArtisans and 7Artisan lenses, and of course, Light Lens Labs, who are painstakingly creating modern, affordable versions of classic Leitz Optics.