Four Thirds System Lenses
The Four Thirds lens mount is specified to be a bayonet type with a flange focal distance of 38.67 mm.
There are currently around three dozen lenses for the Four Thirds system standard.
Olympus produces about 20 lenses for the Four Thirds system under Zuiko Digital brand. They are divided into three "grades" (Standard, High Grade and Super High Grade). High Grade lenses have faster maximum apertures but are significantly more expensive and larger, and the Super High Grade zooms have constant maximum aperture over the full zoom range; all but the Standard grade are weather-sealed. Lenses within each grade cover the range from wide-angle to super telephoto. The Zuiko Digital lenses are well regarded for their consistently good optics. The following is a table of all current Zuiko Digital lenses:
| Wide angle | Standard | Telephoto | Super telephoto | Special-purpose | |
|---|---|---|---|---|---|
| Standard | 9–18 1:4–5.6 | 14–42 1:3.5–5.6 14–45 1:3.5–5.6 17.5–45 1:3.5–5.6 25 1:2.8 "pancake" |
40–150 1:3.5–4.5 40–150 1:4–5.6 |
70–300 1:4–5.6 macro | 35 1:3.5 macro 18–180 1:3.5-6.3 superzoom |
| High Grade | 11–22 1:2.8–3.5 | 12–60 1:2.8–4 14–54 1:2.8–3.5 |
50–200 1:2.8–3.5 | 50 1:2 macro 8 1:3.5 fisheye |
|
| Super High Grade | 7–14 1:4 | 14–35 1:2 | 35–100 1:2 150 1:2 |
90–250 1:2.8 300 1:2.8 |
Olympus also makes 1.4× and 2× teleconverters and an electronically-coupled extension tube.
Sigma has adapted 13 lenses for the Four Thirds system, ranging from 1 cm to 8 dm, including several for which no equivalent exists: the fast primes (3 cm f/1.4 and 5 cm f/1.4) and extreme telephoto (3–8 dm f/5.6).
Leica has designed four lenses for the Four Thirds system: fast and slow normal zooms and a 14–150 mm super-zoom, all with Panasonic's image stabilization system, and an unstabilized f/1.4 25 mm prime. These are manufactured and sold by Panasonic.
An official list of available lenses can be found on Four-Thirds.org web site.
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