Much as we'd have liked to, we haven't developed a variable focal length lens.
What we have done, however, is invested in a complete optical manufacturing CNC cell, with a highly experienced operator to run it. This enables us to manufacture prototypes with very short lead times. We're calling it our RapidOptics service.
The second image (right) shows the typical specifications we are able to achieve. Does your custom part not fit within the specifications? We may be able to achieve better! Call us to discuss your specification, or send a spec through to firstname.lastname@example.org.