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Review Summary
2020-05-28T17:19:48
Acquired to use with my 70-200mm f/4 on an SL, a superb lens on its own, this teleconverter noticeably impacts image quality. Fine details lack acuity, and contrasting edges in details are fuzzy in uncorrected raw files. Contrast takes a hit as well. On the bright side, focus acquisition is fast and accurate on the SL. Judicious post-processing produces usable images. But overall, it's no better than some of the teleconverters made in the '80's and '90's. In 2020 one would expect better. A fine lens like the 70-200mm Lumix S Pro deserves better, especially when the manufacturer promotes the teleconverter as enabling 400mm reach.
William B.
7 elements in 4 groups (2 UHR lenses)
1.4x that of the attached lens
Yes*
*Dust and Splash Resistant does not guarantee that damage will not occur if this lens is subjected to direct contact with dust and water.
65.3mm / 2.57inch
Approx. 27.6mm / 1.09inch (from the tip of the lens to the base side of the lens mount)
Approx. 180g / 6.35oz (excluding lens cap and lens rear cap)

There are two different teleconverters for the LUMIX S Series telephoto zoom lenses - a 1.4x Teleconverter DMW-STC14 and a 2x Teleconverter DMW-STC20. They can be attached to the LUMIX S PRO 70-200mm F4 O.I.S. (S-R70200), enabling the use of the lens as a super telephoto lens with its extended zoom range of maximum 400mm for DMW-STC20 with high-speed, high-precision AF. The rugged dust/splash-resistant* design withstands use under harsh conditions even in 10 degrees below zero for high mobility.
*Dust and Splash Resistant does not guarantee that damage will not occur if this lens is subjected to direct contact with dust and water.