Stardust managers would use heaters to raise the temperature of one or more optical surfaces possibly coated with the goo.

CNN: NASA's Stardust mission develops case of blurry vision

While its optical design is carried over from the previous-generation model, the new-generation lens features Sony's proprietary Nano AR Coating on optical surfaces.

ENGADGET: Sony NEX-3N and Alpha A58 unveiled, heading to Europe this spring