Asobinet found a patent for a Sigma 18-50mm f/2 DC DN that might have been in the works while the Sigma 18-50mm f/2.8 DC DN Contemporary was under development. It is unlikely we will see this interesting f/2 zoom anytime soon, but maybe Sigma will go back to it if f/2 zooms become popular. The design is very similar to the Sigma 18-50mm f/2.8 DC DN Contemporary that is coming to X-Mount in December.
Example 4 seems to be for APS-C from the image height, and is a large-diameter zoom lens that covers from a wide angle of 18 mm to a medium telephoto of 50 mm with an open F value of F2. It is one step brighter than the current ” 18-50mm F2.8 DC DN “, has more blur, and is an interesting optical system that is easy to use even in low light.
Looking at the lens configuration, it looks a lot like the 18-50mm F2.8 DC DN (not a 100% match). Perhaps F2 zoom was one of the options at the stage of considering a practical lens. However, now that the F2.8 zoom has arrived, it seems unlikely that the F2 zoom will see the light of day.
Example
- Focal length: 18.50-48.50
- F value: 1.94-2.10
- Angle of view: 77.86-31.58
- Image height: 14.20
- Overall length: 115.36-137.89
Sigma 16mm f/1.4 DC DN Contemporary
B&H Photo / Amazon / Adorama
Sigma 30mm f/1.4 DC DN Contemporary
B&H Photo / Amazon / Adorama
Sigma 56mm f/1.4 DC DN Contemporary
B&H Photo / Amazon / Adorama
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via Asobinet
