According to Nokishita, next lens for Sigma will be Sigma 150-600mm f/5-6.3 DG DN OS Sports lens for Sony E-mount and L-mount. The US price for this lens will be a bit higher than Tamron 150-500mm f/5-6.7 Di III VXD lens ($1,399). Below is the specs of this lens:
- 25 elements in 15 groups
- A minimum shooting distance of 58cm-280cm, a maximum shooting magnification of 1: 2.9 (at 180mm), and 9 aperture blades (at 180mm). (Circular aperture)
- Filter size φ95mm
- Size φ109.4×263.6mm
- Weight 2100g (including tripod mount)
- Teleconverter (TC-1411 / TC-2011) seems to be compatible.