Lensbaby just released the least expensive tilt lens on the market. $80 for a tilt-only (no shift), manual-focus, fixed-aperture (f5.6), 50mm prime. It's an interesting concept, designed for quick tilt shots (something of an oxymoron, methinks). There's a ring on the front of the lens that the user pulls toward the camera body to focus, then angles relative to the body to tilt the focal plane. Quick, pretty clever, but not suited to tripod work, since it appears the be spring-loaded, so your focus and tilt will be lost when you release the ring.
Lensbaby Spark
I strongly suspect the Spark's main market will be the hipsterish Instagram fanclub crowd, but I do think it's an interesting option for walkabout photography, despite the lack of autofocus. I'm thinking about grabbing one of these, or an up-market sibling, to learn the basics of tilt-shift photography. But before that, what do you gents think of the concept? For anyone who's used Lensbaby gear, is it good stuff?