You've probably heard of Opteka, the company that manufactures lenses, grips, and other photographic accessories and equipment. We found a recent offer on their Facebook page that we wanted to get your opinion on.
Essentially, per the screen shot below (found here), Opteka is looking for two approved photographers to submit images to them in exchange for a lens. You will initially have to buy the lens but it will be refunded to you. It has no mention of what they will do with the images, which we can only assume they will use in some form or fashion. It continues on to future promise of more opportunities of similar sort.
What do you think about the opportunity from Opteka from the perspective of the photographer?