Apertureone

Samyang Optics is a Korean company that develops Mid-level optics that often exceed expectations of image sharpness, colour rendering and overall image quality. 

Soviet glass over the past few years has inflated in price quite considerebaly while remaining a (cheap) option. With the current mirrorles market, the wide variety of M42 & M39 adapters available, Vintage russian and soviet era lenses have bounced back into the spotlight.

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Canon FL mount was prior the FD from 1964 - 1971 although FL lenses fit on FD adapters.

Canon FD mount lenses served as canon's primary mount from 1971 til the1987 introduction of the EOS series cameras, which use the newer and still current EF lens mount.

 

Pentax lenses were originally branded as Takumar. The Takumar branded lenses were well respected for their line of Super Takumar, which designated the high performance coating applied to the lens as well as the optical formulas used to make them. Asahi Pentax soon introduced the Takumar Super-Multi-Coated line of lenses which was a 7 layer process. Eventually Asahi Optical and Pentax slowly shifted much of their lens production under the Pentax name and transitioned some of the successful designs that were first introduced under the Takumar name to use Asahi/Pentax badging as well as beginning to use the "smc" abbreviation. Eventually the Asahi dissolved and the Pentax name became solely used.