There are currently around three dozen lenses for the Four Thirds system standard.

In practice, few Four Thirds system users report having any issues with sensor dust.

There are currently over 35 lenses available for Four Thirds System cameras.

Almost all lenses designed for the Four Thirds system are of this type, as telecentricity is a stated design goal.

The flange back length has been reduced to about 1/2 that of the Four Thirds System."

The Four Thirds System uses this approach.

The smaller sensors of Four Thirds System cameras have a crop factor of 2.0.

The most recent development is Olympus' focus on the Micro Four Thirds system.

The Micro Four Thirds system specification supports lenses with optical image stabilization.

The E-1 uses the Four Thirds System lens mount and imaging system.

Again, the Four Thirds System is a notable exception, with an aspect ratio of 4:3 as seen in most compact digital cameras (see below).

Another version of the camera with a Micro Four Thirds system lens mount was subsequently announced for december 2012, but has yet to be released.

Four Thirds System lenses (Four variations of this adapter exist.)

Four Thirds System lenses can be used with an adapter, although response time, especially focus response, can be slower.

July 27, 2010 Panasonic has announced the development of a 3-dimensional optic solution for the Micro Four Thirds system.

Olympus produces about 20 lenses for the Four Thirds system under Zuiko Digital brand.

The 2x Crop factor of the Micro Four Thirds system means that the field of view is halved.

Cameras for the micro four thirds system are designed with the option of a replaceable lens and accept lenses that conform to this proprietary specification.

"The foundation for the high picture quality of the Four Thirds system is the lens mount, which is about twice the diameter of the image circle."

The E-3, like the other cameras in the Olympus E-series, conforms to the Four Thirds system.

As a result, newer Four Thirds system lenses were designed both for PDAF and contrast focus.

Olympus' Four Thirds System digital format of 2002 is the latest attempt at a narrower, albeit not square, format.

The design has seen a resurgence due to the growth of the mirrorless interchangeable-lens digital camera market, notably the Micro Four Thirds system.

The E-410 body and lens mount conform to the Four Thirds System standard, providing compatibility with other lenses for that system.

Like the E-400, the E-410 is notable for its small size, omitting the hand grip and exploiting the smaller sensor of the Four Thirds System.