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Another tele-zoom lens, 50-200mm f/2.8-4, for 4/3 sensor from SIGMA [Patent]

SIGMA filed another patent of 50-200mm f/2.8-4 tele-zoom lenses for 4/3 sensor.

【公開番号】特開2019-53122(P2019-53122A) click here
【公開日】平成31年4月4日(2019.4.4)
【発明の名称】変倍結像光学系

Specification and lens arrangement of embodiment 1
Zoom ratio: 3.90
Focal length: 50.00 - 97.65 - 195.00 mm
F number: 2.91 - 3.15 - 4.02
Angle of view: 23.93 - 12.28 - 6.22
Image height: 10.82 mm
Lens length: 150.00 - 178.82 - 195.00 mm
Back focus: 22.5906 - 22.5906 - 22.5903 mm
JPA_431053122_000003.gif

All lenses in the patent are similar to "LEICA DG VARIO-ELMARIT 50-200mm / F2.8-4.0 ASPH. / POWER O.I.S.", but not equal to that one.
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