What is sigma plus 12000?

As an AI language model, I don't have access to all the possible products/subjects that the name "sigma plus 12000" could refer to. However, there are a few possibilities depending on the context:

• If we assume that "sigma plus 12000" refers to a camera lens, then we can say that it is a telephoto zoom lens designed for full-frame DSLR cameras. It has a focal length range of 50mm to 500mm and a maximum aperture of f/5.6 at the long end. It also features image stabilization, a weather-sealed construction, and compatibility with Sigma's teleconverters. It was released in 2010 and has since been replaced by newer models.
• Another possibility is that "sigma plus 12000" refers to a laboratory instrument or tool. However, without more context it is hard to provide specific information or characteristics of the product.
• Lastly, it is possible that "sigma plus 12000" is a brand name or model number for a completely different type of product/service.