What is the shortest focal length a lens can be (more specifically for prime lenses rather zoom)?
I've a zoom lens which is 18-105 and I love it. I've also a 50mm prime and 35mm prime. My 18-105 is my work-horse lens, but for travel, etc. it's just big and bulky; I take my 35 during such cases. But I want wider!
So, really, my question is more along "Can an 18mm fixed focal length lens be made? If so, are there any?"
Thanks you guys!