On Sep 26, 2006 Sigma announced the 18-50mm F2.8 (Amazon | B&H) lens for APS-C DSLRs. After that they announce 17-50mm F2.8 lens (B&H | Amazon) on Feb 10, 2010 as a successor of 18-50mm F2.8 lens with IS and improved optics.
Now, a new patent surfaced over the web that shows new version of Sigma 18-50mm F2.8 Lens with IS.
Take a look at the patent details below
SIGMA filed patent of 18-50 mm F2.8 for APS-C sensor with very short back focus.
This patent may be for one of new dp/DPs.
【公開番号】特開2017-211496(P2017-211496A) click here
【公開日】平成29年11月30日(2017.11.30)
【発明の名称】大口径防振付きズームレンズ
Specification and lens arrangement of embodiment 1
Focal length: 17.55 – 48.47 mm
F No.: 2.92
2ω: 81.42 – 32.32
Image height: 13.49 – 14.20 mm
Back focus: 1.0000 – 22.4957 mm
Lens length: 126.29 – 166.99 mm
If a true successor of 18-50mm F2.8 is coming After 10 years of Gap we do expect a lot of improvement in optics, AF speed, IS and overall performance of the upcoming Sigma APS-C lens.
We will update you soon as we get any new information. Also see Sigma new Foveon image sensor patent.
Why oh why 18mm, 16mm would be much better, giving it an effective 24 or 25.6mm on DX and Canon APS-C
They should announce more F1.8 based lens for APS-C series. I do have the 18-35mm F1.8 lens for 80D but is the F1.8 range reaches to 50mm… it;s all great.