Egami spotted new patents filed by Sigma. The patent describes several new ART series wide-angle zoom lenses for APS-C sensored DSLRs.
These lenses are Sigma 15-30mm F1.8, 17-35mm F1.8, 16-50mm F2.8, 12-24mm F2.8. Like all patent news we have to say these lens names doesn’t mean they will all going to be announced.
However we can say that Sigma is working on high quality ART Series wide-angle zoom lenses for APS-C format DSLR cameras.
Sigma Patent for 15-30mm F1.8, 17-35mm F1.8, 16-50mm F2.8, 12-24mm F2.8 Lenses
Here is a list of upcoming new Sigma Art series wide-angle zoom lenses :
- 15-30mm F1.8 DC HSM
- 17-35mm F1.8 DC HSM
- 16-50mm F2.8 DC HSM
- 12-24mm F2.8 DC HSM
Description and self-interpretation of the patent literature
- Patent Publication No. 2014-89365
- Publication date 2014.5.15
- Filing date 2012.10.31
embodiment Example Zoom ratio Focal length Fno Angle of view Length One 1.82 18.60-26.02-33.78 1.86-1.86-1.86 76.12-56.68-44.80 168.50-168.50-168.50 Two 1.84 18.50-23.97-34.00 1.86-1.86-1.86 76.59-61.06-44.54 163.25-162.61-166.00 Three 1.88 15.44-21.97-29.11 1.86-1.86-1.87 86.78-65.35-51.12 166.00-160.90-161.03 Four 1.94 17.50-24.98-34.00 1.86-1.86-1.87 79.70-58.89-44.53 165.52-161.31-163.21 Five 2.95 16.45-30.01-48.50 2.89-2.90-2.91 83.22-49.80-32.03 169.00-151.78-152.70 Six 1.87 15.50-22.03-29.00 1.86-1.86-1.86 86.43-64.77-51.29 163.50-163.50-163.50 Seven 1.86 12.42-16.88-23.16 2.89-2.89-2.90 99.06-79.32-62.02 166.00-166.00-166.00
Image height Y = 14.20mm
- Sigma patents
- 4-group zoom of positive and negative positive negative
- Inner Focus (group 2)