Sigma Lens Reviews
Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma) is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Although Sigma produces several camera models, the company is best known for producing high-quality lenses and other accessories that are compatible with the cameras produced by other companies.
Sigma products work with cameras from Canon, Nikon, Pentax, Sony, Olympus and Panasonic, as well as their own cameras.
- Wikipedia.org, Jan. 2020
- ASP — Aspherical lens elements
- APO — Apochromatic lens element(s), originally for "Advanced Performance Optics", not necessarily apochromatic
- OS — In-lens "Optical Stabilization", analogous to Nikon VR or Canon IS
- HSM — "Hyper-Sonic Motor", either in-lens ultrasonic motor or micro-motor, analogous to Nikon SWM (AF-S) (ultra-sonic or micro-motor), Canon USM (ultrasonic or micro-motor), Minolta/Konica Minolta/Sony SSM (ultrasonic motor) or Sony SAM (micro-motor), etc.
- A — "Art Series", large aperture prime and zoom lenses, high optical performance. USB dock compatible. Part of 2013 lens lineup restructuring.
- C — "Contemporary Series", combining optical performance with compactness. USB dock compatible. Part of 2013 lens lineup restructuring.
- S — "Sports Series", telephoto and super-telephoto lenses. USB dock compatible. Part of 2013 lens lineup restructuring.
- EX — "Excellence", EX-finish, high performance series.
- DG — "Digital Grade", coatings optimized for DSLRs, full-frame as well as APS-C, also usable on 35mm film SLRs
- DC — "Digital Compact", lenses for DSLRs featuring APS-C size sensors, only
- DL — "Deluxe", indicates lower-end film era lenses
- DN — "Digital Neo", lenses for mirrorless interchangeable-lens cameras.
- DF — "Dual Focus", lens features clutch to disengage focus ring when in AF mode
- FLD — "'F' Low Dispersion" glass, the highest level low dispersion glass available with extremely high light transmission. This glass has a performance equal to fluorite glass which has a low refractive index and low dispersion compared to current optical glass
- HF — "Helical Focusing", front element of lens does not rotate (useful for polarizing filters and petal lens hoods)
- RF — "Rear Focusing", lenses employing rear-focusing, no length changes during focussing, no rotating front elements
- IF — "Inner Focusing", length of lens does not change during focusing, no rotating front elements
- UC — "Ultra-Compact"